HDFC Bank — cancellation of one assist membership

I am a hdfc bank credit card holder. The bank has auto debited rs. 1899/- from my credit card number ending with 2295 without my concern on date:23/02/2018. 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.1899/-

Oneassist relationship number : 1748045
Name :-bharat kumar r
Mobile no. :[protected]
Credit card number: [protected]