HDFC Bank — credit card

Address: Gautam Buddh Nagar, Uttar Pradesh, 201301

I am lost my mobile so i need to update my current mobile number with my credit card. But procedure is very challenging with hdfc credit card. I send mobile number change request form to credit card department but not yet updated. I am unable to doing any online transaction. Would request you please update my number. My card ending with 7941.

Thanks

Regards
Ram vikash verma
[protected]