HDFC Bank — one assist membership cancellation

I am a hdfc bank credit card holder. The bank has auto debited rs. 2499/- from my credit card number ending with 3593. I am not interested about this service and don't want this membership any more. So cancel the membership and refund this debited amount of rs.2499/-

Oneassist relationship number : 2755164
Name :- chella pandi. G
Mobile no. :- [protected]
Credit card number ending :- 3593