HDFC Credit Card

My name is Amitabh Singh.I owe an HDFC Bank credit card.I met an accident last year for which i had to withdraw some amount from the same.The bank applied so much tax that i had to pay 2,60,000+ 3,60,000 for the down payment.Now i had paid the whole amount 0n 27-06-2014 and also closed my credit card account with the help of HDFC Bank customer care.But now after 13 days of account closure again they have applied some finance dues and again asking me to pay 1087 INR/- I am totally fed up with this bank and wish to stop their wrong enforcement. can you please be so kind and update me how can i close this card ?

My Account Details are following
Account holder Name : Amitabh Singh
Cradit Card number : 4346781013617584