[Resolved]  HDFC Bank — Disturbance from collection officer

In year 2005 a credit card was issued to me with miss informed facts.
After two months they came up with a payment of some[protected] rs. against my usage of 4700 aprox.
Where as I had asked the agent to mark an auto credit transfer facility from my saving account in HDFC bank.
I cleared the actual payment of 4700 (aprox.) and asked the agent give full & final receipt of the all dues clear certificate.
This was done.
After that every six months HDFC used to wake up and ask for the balance payment.
I tried wasting every time few hours to explain the situation to every body in the department.
This time after 4 years they again called me for the same.
I was disturbed beyond the words could explain with decency.
I want to put up a harassment complaint against the HDFC credit card department.
I don't know where to do that to set things right.

Pls help me nail down the miscreants named HDFC collection agents.