credit card payment debited but merchant not got the amount?

i had made a online payment from my HDFC bank credit card for indiatimes shopping. amount has been credited to my credit card but merchant is denying that having received that money, in fact my order also has been cancelled.
but bank is not providing me enough proof with that i can prove to merchant that payment has been credited to his account.
what i can do in this regard. Anoone has answer for it?