HDFC Bank — Unauthorized credit card bills

Address: Khordha, Odisha, 751001

One Assist is a third party service provided by HDFC bank. How ever they did activate the service & charge the amount without my permission. when i complain to HDFC, they told me to directly contact One Assist. Seriously these one assist people dont have any manners how to talk, they talked rude and they told once the service activated cant be refunded . so it was a waste talk to them. so i told HDFC bank about these issues, now i got only 30% the amount debited. What the hell with HDFC & its service. Total dissatisfaction from customer end.