HDFC Bank — one assist activated without my information and fee debited without my concern

I have recently applied for the credit card. Before pin generation i got message that the hdfc bank has auto debited rs. 1299/- from my credit card number ending with 9582 without my concern for one assist. I am not interested about this service and don't want this membership any more. How can hdfc start any service for customer without my prior information and permission. Also they started emi. For this amount its totally unacceptable, also their customer care numbers are unavailable and cannot be reached. So cancel the membership and refund this debited amount of rs.1299/-

Oneassist relationship number: 2864201
Name :- jinkal chauhan
Mobile no. :- [protected]
Credit card number ending :- *9582