(i) It seems that flat was allocated to us (by letter) even before sanction by competent authority. (might have been sanctioned at a later date). How to establish this (location: Rajarhat, Kolkata)? Can this be a ground to void the agreement and claim refund of advance?
The issue is to be manipulated favoring your expression on the basis of their hidden or non-transparency agenda. You should draft a a carefully worded letter .
(ii) The master plan showing layout of buildings in brochure were changed altogether (number of flats almost doubled to 3500 flats) without intimation, which we came to know only at the spot of lottery. Master plan in website was updated much later.
Even this can be cited as a reason for cancellation of booking.
(iii) New clauses introduced in sale agreement, which were not there in terms & conditions I have signed at the time of booking. Is it possible to come out of agreement citing that new clauses are not acceptable?
If the added new clauses are not agreeable, you can protest and walk out.
(iv) Amenities / facilities advertised in newspaper are not appearing in agreement. None of the banks (whose name appeared in advertisement around a year back) have approved the project.
Also, please suggest on the below issues:
If the cited banks did not approve the loan, the project is clouded with mystery, you need not proceed and can mention that the facilities advertised are not included in the agreement.
a. They are ready to show documents but not willing to handover copies. Later they might disown a particular document. How to address this.
You have to insist on the copies of the documents shown to you and can quote that you need to get opinion fro your own lawyer, if it is not acceptable, you may refuse to sign he agreement.
b. If the matter is taken to court probably the property cannot be transferred / sold. If I issue legal notice today, is it legally correct to transfer / sale the property in case a buyer is willing to buy as per the existing T&C imposed by promoter?
It depends on the situations prevailing at your end, If there is buyer willing to buy despite ware of the pending litigation, it will be solely his risk.
c. As per the letter from promoter 1st instalment is payable within 30 days of sale agreement. In case I do not execute agreement for the above reasons and communicate the promoter by mail / registered post, can they really charge interest?
If you have entered into the agreement you re bound to honor it or else it will be treated as breach of agreement and the penalty whatever to be paid.