P Gopala Krishna — one assist deactivated

I didn't got any call from one assist regarding their plans, but they charged me rupees towards for one assist subscription. When i called to hdfc and one assist people they told they they will deactivate but the thing is only half money they have credited, what about other half as i did not get any intimation before activating this service. I just don't want the subscription and please cancel my subscription and credit the entire amount back to my hdfc credit card ending with 6880, other wise cancel my credit card.
Kindly refund and deactivate this service on urgent basis.'don't activate this type of service in future
I am not happy with your service i have not opted for this policy and please refund my money back as soon as possible.