HDFC Bank Bank Credit Card — un nesessary harrasement

Address:

Bulandshahar, Uttar Pradesh

sir,
my self rajkumari verma, i had taken hdfc credit card which was issued against the FD. regullarly i am making payment to the card .
now the problem is bank is regularly hassaring me over the phone for the payment and telling that i had not made any payment and deposit.
but as par the credit card statement it is shown that in the payment recieved colume that this much of the amount is recieved.
bank is telling that they do not consider the refund amount as payment recieved and saying that u have to make the payment.kindly help
thanking you