This means that he knew that he didn't have it and duped you into this sale and jeopardized your chances of loan. 

Now you shouldn't file an fir as you didn't lose it. You don't have to take the responsibility. File a complaint against him for cheating and criminal breach of trust. 

For meanwhile to complete your bank procedure first you give online FIR and two newspaper advertisement one in English and other in local language. Later apply for photo copy of sale deed in registrar office.

After completing above procedure than file case against seller for fraud, cheated and misrepresentation and ask for compensation in it and do mention in your petition otherwise his passport will be impounding if he couldn't compensate your money.

You need to file a suit against the vendor at the proper court through a competent lawyer for delivering the original sale deed in his name or for cancellation of the sale in your favour and refund of the sale consideration to you. Make the bank also a party to the suit.

Issue legal notice to seller to hand over the original sale deed 

2) if he fails to do file police complaint of cheating against seller under section 420 of IPC 

3) it is responsibility of seller to make out clear and marketable title to property 

4) you can also file suit to set aside sale deed and seek refund of money paid by you with interest 

You seller has committed an offence of criminal breach of trust under Section 406 punishable with imprisonment up to three years. The offence  is cognizable and non bailable. You have two options.

1. Issue him lawyer's notice seeking original sale deed. Mention that he promised to handover the same on day of registration so that he cannot claim he lost it. Warn him of criminal complaint against him, issue of LOC and extradition, as there is now extradition treaty signed between India and all gulf countries . After that file a complaint in the Court of Magistrate. A direction will be issued to police to register FIR, investigate, produce the accused through LOC, you can even get an extradition order and direction for cancellation of his passport. The proceeding my take time but you can teach him a lesson, if you can wait.
2. Issue public notice, file FIR for loss of original. But by doing so will be taken as admission that seller has handed you original.

You issue a legal notice to the seller intimating your decision to cancel the sale deed for the act of cheating done by him and demand refund of the amount paid towards consideration of sale with interest from the date of payment, failing which you can mention that you will lodge a criminal complaint against him for the offences of cheating, breach of trust and other fraudulent acts.

If he is still maintaining silence , you may give a complaint with the local police for the acts of cheating and breach of trust.

Firstly it was your fault for not obtaining a legal opinion from a lawyer before making payment towards purchase of this property, hence you may have to undergo the arduous procedures in this regard.

At any cost you do not give any complaint for the loss of original document as well as giving a paper publication in a newspaper.

i dont think now you can do anything against the vendor and even if you do it will be an exercise in futility 

before proceeding to register the sale deed in your favour, did you even take inspection of the original title chain documents?

if you did not then you are equally responsible 

since the old sale deed is lost, it would be prudent to file the FIR since an FIR can be filed by anybody and not necessarily the vendor has to file such FIR. In this case since the property has been sold to you, you can all the more file the FIR as required by the bank

also please issue the public notices in newspapers

at the highest you can file a suit against the vendor to recover the expenses that you had to incur for filing the FIR and publishing the newspaper notice. however the cost of such suit would be far more than the money sought to be recovered

so what has happened has happened. now no use escalating the issue any further

now you have to comply with the lender's requisitions so that your loan is sanctioned. so plz spend your energy on that

i understand your ordeal and the vendor is wrong. but here the circumstances are such that doing anything is like a fait accompli

- Since a registered sale deed is executed in your name , then you are the legal and absolute owner of that property and the  property has been transferred in your name legally. 

- Further in the absence the earlier sale documents your ownership will not effected , however for taking loan all chains of last ownership are required.

- Further, as the seller has refused for the same , then you should send him a legal notice to him to handover the earlier chains of the property . 

- Further even if no response , then file a compliant before the police for missing of those papers , and further publish a notice in newspaper after mentioning that those papers are lost and if any found the same then that will not valid as the property is under your ownership. 

- Further, you can take the certified copies of those documents from the office of the registrar for submitting in the bank for getting loans. 

Dear client I am sorry to hear that what is this kiss you can file a complaint against the salad for cheating and fraud

Here on behalf of Seller .. you perform online FIR and give Advertisement in two newspaper belongs to Delhi one in Hindi and English's newspaper.

If you assign this task to me, I will perform both the services.

You can resort to legal action against your vendor to lodge a criminal complaint for cheating you by not furnishing the original deed.

You can follow the steps suggested in my previous post in this regard.

If the seller doesn't even want to this tiny bit then you  an do this on his behalf but take a letter of authorisation from him and state this in the police station.

Number of lawyers on this website from Bangalore having good ratings 

contact any of them 

seller should file online FIR and apply for certified copy of sale deed from sub registrar office 

Compel seller to help you, by issuing lawyer's notice. There are grave consequences for him if a complaint is filed and properly followed up. Once you file FIR, it amounts that you have received original sale deed. 

- You cannot publish the notice in the name of seller without taking his consent 

- Further, as the property is already purchased by you after registering from the office of the registrar , then you can lodge a compliant against him for the offence of breach of trust and misappropriation. 

- Further, after giving details that the said chain of documents are lost or refused to handover to you , then those paper will have no legal value if somebody will try to misuse the same. 

You are free to engage a competent lawyer of your choice, either from this forum or from elsewhere.

Yes suit for specific relief needs to be filed