Credit Information Bureau India Limited [CIBIL] — Citibank auto debit fraud

Address:

Bangalore, Karnataka, 560030

Dear sir, i had givin citibank an auto debit fecility on my citibank creditcard towards my royal sundaram health insurance. citi bank was the broker for my policy. i stopped and opted for a different policy from royal sundaram itself,
citibank has debited my credit card for the old policy and is charging me for the cancelation and other fee. i have a reference number confirming the cancelation of the auto debit to royal sundaram one month prior to the auto debit date . they are saying it was a mistake from their end, but i still have to pay.

i am not using my citibank creditcard for anything else and hence i have to pay nothing.

how do i handel this without loosing my cibil rating, as have no fault in this, and have all referance numbers to ctibank . i want to cancel their card