Standard Chartered — excess amount auto debit from my a/c

I have a a/c in standard chartered bank which no is [protected]. On behalf of this saving a/c bank is giving me a visa gold card which no is [protected]. The card was in regular use for a long time and all the purchases made were being paid off in time. But suddenly from July 2006, the bank started to charge some auto debit amount from my a/c. Against of this auto debit bank has started to charge interest and service tax also. On contacting to the customer care, they told me this amount to be debit against the fueling charges.
For your information the total amount which ware I spent for re-fueling hardly Rs 7, 800.00 but bank was charges till today Rs 12, 000.00 against these transaction and every month they were auto debit Rs 550.00 from my a/c+interest charges + service tax. When I register a complaint against this amount your customer care was refuse. I also want a statement of this particular amount but almost three month over they didn't provide me the statement.
I view of above, you are requested to please take up the matter with above bank and arrange to reverse all the unjustified and unsubstantiated amount charges from the a/c.

Suresh Chander Bhatt
House No 71-E Pocket No 1
Phase No-1 Mayur Vihar,
New Delhi-110091