Illegal Bank Loan Recovery

X trusts borrower (B) and gives consent letter and signs on sanction letter for B in Jan 2013. Loan of 50 Lacs is sanctioned to Private Ltd. Company. Collateral of property is kept with bank by B/X (not sure of contractual documents signed or not). X comes to know that bank is demanding 80 Lacs in March 2017 as the limit was increased by bank to 80 Lacs in past (July 2013 without informing X). Bank issues notices to X. X, not an expert in legal understanding tried to raise RTI in April 2017, via spouse. RTI was rejected. Again an RTI was raised, in this consent letter was asked and not Deed of Guarantee. Bank replied that consent letter of 50 Lacs is available, though not for 80 Lacs. X demands signed documents (Deed of Guarantee) copy from bank, bank tries to avoid for long duration. Instead, bank take symbolic possession of property in June 2017 and gives a last date to deposit the money. X panics and pays money (45 Lacs) to release his property one day before last day. Bank releases the property without giving deed of guarantee. X reaches to Nodal Officer and asks for documents, bank provides not attested documents to X. Surprisingly these documents did not have relevant contractual documents. Bank has however replied that it has provided all documents. X takes fights ahead till Chairman of bank for contractual documents. Finally branch/regional office provides an answer that bank has no contractual document with it. It has done all recovery procedure based on consent letter and sanction letter (50 Lacs). X wants to fight against the illegal recovery done after undue favour to defaulting company (corruption). Is it possible to recover money and get these guys punished for the mental harassment they have been doing for few months?