ICICI Bank — Blockage of card without proper intimation

Address:

Thiruvananthapuram, Kerala

i have been using a Federal Bank - ICICI Bank co branded credit card for years together, atleast for more than 5 years. There was an amount due on my card, but was blocked (permanently/temporarily) without even intimating me. Why was this done ? How do i get this unblocked ? Please let me know. ICICI customer care does not give me a satisfactory reply afterall.

Jacob Mathew
Mob: [protected]