HDFC Bank — charged for service that I am unaware of

Hello,

My self gopi ramankatti using hdfc moneyback credit card which is actually inactive.

I got charged by rs.1399/- on 23 march 2020 for the service which i am unaware of namely to say is one assist mfee.

I don't know who gave you the right to do this, and also i tried to call customer care but with no response, i am writing here, please look in to this, as i don't want to pay any amount for the services which doesn't make any sense to me.

Hopefully i will get my charged money back.

And please block such services, i don't want anything of such services. Otherwise will block my account and all customer relationship with hdfc bank. It is not acceptable from such reputed bank.