As you are disclosing the story gradually and a little at a time, I am still not able to get an overall picture. You issued a cheque dated 15th September, 2011, but there were no sufficient funds on the date in your account to clear the cheque. The bank is under no obligation to inform you. The same bank is also payee of your cheque. As a payee they may inform you, but again they are not obliged to inform you. Generally banks do not inform the credit card holder about return of cheque. If you were a responsible card holder you would have made certain that sufficient funds were available in your account on the relevant date. If you were not able to do that, you should have approached the bank and asked them what could be done. If the due date was on or later than September 20th, 2011, you should have offered to pay in cash on that date or given them another cheque. You are saying that bank was insisting on paying the “whole amount” and settle the account. It implies that you owed more than Rs.20000/- to the bank, but the bank had earlier allowed you to make part payment of Rs.20000/- only and settle the balance amount in future installments. It may be that you were advanced loan on the condition that you were allowed to gradually settle the amount in installments and in case of default on your part of any installment, the entire amount would become payable immediately. That may be the reason that the bank wants you now to settle the full amount. It would not be that the bank has withdrawn Rs.45000/- from your account. It may be that they do not want to allow you to withdraw the amount and run away without repaying the loan.
In any court of law you depose on oath that you will speak the whole truth. If you file an affidavit in a court of law, including a Consumer Forum, you have to support it with a “verification” statement that, among other things, you have stated the whole truth. It is required even for filing income-tax returns.
You may receive advice to do so many things quoting Sections from Laws. But remember, you must have a case in the first place if you should succeed.