HSBC Credit Card — outstanding for non-used credit card

Sir,
HSBC card No- [protected] was issued to me in July'05.
At the time of issuing, I was told that this card was free of charges .
I NEVER USED this card.
This card was cancelled in Aug/06 by the Bank.
I cut the card into four pieces and dropped it into HSBC drop box in Oct'06.
In Sep'08 I received a call from the bank to pay Rs.14000/- as outstanding.
I contacted Customer Care who confirmed that this card was NEVER USED but they were unable to tell the reason for outstanding.
I received a bill with outstanding of Rs.20457.45 in July'09.
I had correspondence with Mr. K.C.Mahesh and Ms. Sathya Srinivasan at Chennai who gave me a number of debt management official[protected].
I contacted there who gave me another numbers[protected]/611/622/629), but all numbers are found not existing.
Now I am submitting this on the site with the hope to solve the problem and cancel the amount wrongly debited against me.
Thanks.

S.M.Srivastava