HDFC Bank — credit card

Address: Dehradun, Uttarakhand

I have purchase a credit card through your online phone banking service of hdfc bank
I get my credit card in within few days but in my credit card they given me a one assist insurance policy and they taken a charges of that but due to non requirement of this insurance i cancel this insurance policy but they take rs 399 charges for their cancellation of this policy they never told me for their cancellation charges now they are add this amount in my monthly credit card statement. It's such a bad experience of my with hdfc kindly remove this cancellation charge in my statement i don't want to pay this kind of charges which i don't want. Kindly arrange a call as soon as possible in my no.