See voice recording can be considered as proof in the court though you need substantial evidence to prove your case like the account statements.

Yes a case can be filed for your money. The acknowledgement is sufficient in the recordings so that you can get your money back.

Regards 

But proof of recording should be reviewed by experts than only court accept the digital evidence.

You can file a cheating complaint against him. You can try to recover of cash through suit in civil court

Dear Client 

If you have the Voice recording of your relative then you can send him a legal Notice through An Advocate for recovery of the dues from him.

After that you can initiate recovery suit against your relative. And this voice recording can be considered by court after verification by experts.

1) if you have given money by cash and you have no receipt for money advanced by you  not any agreement with borrower you would  not get any reliefs from court 

2) mere audio recordings may not be sufficient to prove your case 

3) issue him legal notice to refund money advanced by you 

Mere recordings are not sufficient for obtaining decree from civil court for recovery of money 

Dear Queriest

Yes the same shall be considered under the Verbal Contract.

Get the same transcripted.  Swear an Affidavit section 65B of the Indian Evidence Act.

Preserve the recording s on the original device. Preserve the original device for Forensic Investigation if Court orders so.

Annex the same and move a case of specific performance in the Civil Court in your city

Voice can be use in evidence but tough to prove . Lengthy process. Send him legal notice first.

file a criminal complaint against him in the police station u/s 420 IPC and get FIR registered. Alongside file a suit for recovery of money under Order 37 CPC. 

Audio Recordings are admissible as document in Indian Courts, if they fulfill certain conditions as laid down by Apex Court in Ram Singh V Col. Ram Singh AIR 1986 SC 3

you can proceed. 

1. There is no agreement between you and him.

2. Phone recording is electronic evidence which is admissible in evidence, but do not directly file the case on the basis of phone recording. Firstly, serve a lawyer's notice to the borrower and then you may file a suit for recovery of money in the civil court.

Send a legal notice to him and take the ground that you have sufficient evidence as prove to show that money has been given by him. 

Regards 

These recording can be filed with an affidavit under section 65B of the Indian evidence act to prove your case. 

Regards 

On the basis of the phone call recording you may lodge a criminal complaint against the borrower with the local police, let them summon him and inquire about it, once he steps into police station he may get scared and may agree to settle the amount.

In the absence of any proof for having lent the amount you may not be able to succeed if you take any legal step for recovery other than the police complaint

The voice recordings will help the police to extract truth from his mouth once they summon him for inquiry on the basis of your complaint

1. As per the information mentioned in the present query, makes it clear that you have given money to him on the promise that he would give you the property.
2. Yes, if you have the recordings or even messages wherein he has admitted that you lend some money to him then you will be getting the same back after serving a legal notice upon him and then if no positive reply within 15 days of serving the notice, file as suit for recovery of money before the court of civil law along with the prayer to give interest on the amount and the litigation fees.
3. And if you have the proof in the recordings that he has given you the assurance to give property to you then you can also file a criminal case of cheating against him along with the civil suit.