HDFC Bank — block account

Hdfc bank has blocked my account due to non payment of credit card. However, i have made the full payment for the credit card ending *9373 and waiting for release of account as it is my salary account. I have even called up phone banking from where i was given the contact of collection department. However, the collection department seems too busy. I am aware that the bank will try to harass me and even abuse me. However, why should you harass a customer even after the full amount has been paid?? I have also attached the transaction details of making the credit card payment.