HDFC Bank — Credit card noc not received after payment

Address: Mumbai

Respected manager,
Writing this to highlight i did full payment asked by bank executive to clear my credit card bill payment in cash year ago or more than that. Now i am recieving credit card bills every month though i am not using it.. I was informed my card is permanently blocked and cannot be re-activated.
I have sum of 28000/- hold amount on my account. Nobody has answered my query, i contacted customer care number hdfc mumbai care numbers visited branch too. Everyone is asking me to make payment but no one is sure whether this amount will get released or will be full deduction.
Kindly look into the matter awaiting for your reply.