Harassment

I was an ABN Amro Bank Card Holder of Card No 5415382311384705. In the year 2007 I had opted for settling the due amount and closing the card services. The amount agreed for settlement was fixed at Rs.12,500/-. The amount was paid in cash to the agent of the bank, Matrix Processing House on 19th December 2007. I received no closure letter and when I received the statement from the bank it showed an outstanding amount of Rs. 7000/-. There was no entry of the payment of Rs. 12500/- made by me. I had mailed the receipt and enquired about the same with the concerned official at ABN Amro Bank and even mailed them the receipt. However there was no response on this. Now even after 10 years of that I receive calls from unknown sources claiming to be agents deployed for recovery of an outstanding amount of Rs. 12000/-. These callers harass me at my workplace even today. I do not know whom to approach since ABN Amro Bank stands dissolved as per the current scenario.