Partner took loan for property not paid bank harassing me

I own a property in west delhi. A couple of years ago, a friend(which i later found out to be fraud) fooled me and made me a partner in his small business firm and took a loan from a reputed bank against my property with some insider help and incomplete document and without giving me any share(of which i have proof). He said he was in financial crisis and would pay the loan as soon as possible. But later he disappeared and the manager got transferred and the bank wants me to pay the whole amount. When asked for help, they don't want to even talk. Please tell me what steps should be taken?