Standard Chartered Credit Card — Standard Chartered Credit Card

Dear Sir/Madam,
I had made a full outstanding payment of my Standard Chartered Credit Card about 4-5 months back and asked for a deactivation of my card. I stopped receiving monthly statements at my address. Last week, I received a call from the Standard Chartered collections department and they are asking me to pay Rs.3900. After asking for details, they said that there was an outstanding of Rs.800(which was not there when I made the outstanding payment) which has added up with interest to Rs.3900. They called me after 4-5 months all of a sudden. I want to make an official complaint against against the company. Please let me know how I should go about this.

Regards,
Aman Bedi