HDFC Bank — cancellation of one assist membership

I am sonal jain an hfdc credit card holder and the hdfc people have activated this one assist membership by saying that they are not going to activate it rather they are going to keep it on hold. After some days i receive the message stating that 2499 amount is due for one assist membership. And i am not interested in any of these things. So i want you to cancel this and refund me the amount also.

Oneassist relationship number :-2800182
Credit card number ending :- 0585