Bank loan was taken but agreements were not provided to the account holder.

My mother had taken a loan from AXIS bank (Loan against Property) for an amount of appx 50 Lakhs. The bank however forged the signatures of my father, kept the loan documents blank and willfully concealed sending the loan agreement dockets to my mother. If the loan dockets were sent we would have noticed the forgery done by the bank of my fathers signatures. when there were irregularities on EMI's the collections dept menatlly and physically harassed my mother as she was living alone. They threatened and used to come at odd times to our residence. My dad who was abroad when the application was filled was notified by the bank on EMI dues and he questioned the bank stating he did not apply for any loan why should he pay. they send him ( for the first time since the loan was availed) a single page document where his sign was present. He immediately realized that it was not his sign and nor my mothers handwriting. he then, on his immediate vacation to india, visited the branch and asked them to give the agreement papers and the bank declined to do so. Due to the torture by the bank, my father decided to close the loan. once this was closed we started requesting for the loan papers ( agreements) but bank never gave it. Ultimately after email / regdd post communications, we filed an RTI and got the papers and now we can clearly see that the papers were left blank for my fathers sections, signs were forged and the papers were not purposely sent to the account holder. now how do i claim compensation for the amount we have paid. my father was willfully included in the loan, my mother was not aware as she had signed her part and given to bank and then bank did not send the completed documents since they would be caught. - i need to claim the entire paid amount back or atleast the interest paid - i need to check for the options to get compensation for the threats and mental harassment done by axis bank by sending goondas home for recovery,