OneAssist Consumer Solutions — unauthorized usage of my credit card - please cancel my membership

This is muthukumar from tamilnadu having new hdfc credit card ending with 4204. Without sending any prior notification, one assist took rs 1399 from my account and it is reflected in my credit card statement.

Without my knowledge or permission, how could its possible. I want to know that without my acknowledgement how come you debited the fees from my account?
I want to know the answer.
I also got an msg with the relationship number.

Relationship number 142250
Contact number [protected], [protected]
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OneAssist Consumer Solutions customer support has been notified about the posted complaint.
Nov 24, 2017
Updated by Muthukumar Nallathambi
I got a call from this number ( ended with 9859) and they introduced me that one assist customer care service.prior to that they send mail to me to provide contact number for discussion and I properly replied.Later on I got called from the above mentioned number and they said that need of my credit card number and valid thru date for providing refund.

I said that last ending four digits of my card but they tried to get my full number.
I don't understand their principle and why should I provide my card details to one assist customer care.

How could they taken money from credit card account and more than that they know clearly how to refund the money by checking my phone number

So I formally request you that refund the amount and cancel my membership .
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