HDFC Bank — credit card

Cancellation of one assist and refund of money
Without any consent from me, it is surprissing how hdfc bank deducted money for activation of one assist plan. Evan i had nit yet activated my credid card yet but the money was debited without my knowledge and consent.
I just receiced sms that one assist membership fees is debited to my credit card. I am surprised to know how bank can do this without my consent or evan when i had not provided my card number to one assist. But without my knowledge i got sms that one assist membership fees is debited to ky card ending 8025. Evan there is no mention of amount debited.
Please do the needful and reverse the charges.
In future also dont activate any subscription. Mobile number [protected]