Property purchased via auction and refund

Issue legal notice followed by suit for specific performance or recovery through a local prudent lawyer.

You have raised online complaint with consumer forum but it is not known whether you have filed the case.

It is also not known that what were the replies from various authorities with reference to your complaint made before them in this regard.

You have sent only emails to the bank but have not followed up with the bank through any legal process.

Therefore you may issue a legal notice to the bank demanding them to execute a registered sale deed on the basis of the auction sale of property, if they don't reply or comply with the demands made, you may file a suit for specific relief against the bank seeking direction to the bank to execute the sale deed in your favor or to return the consideration amount with interest  till the date of settlement.