HDFC Bank — Unauthorised transaction done by bank

A charge of rs. 885 has been issued on my bank account by the name of debit card annual fee without any notice of the same.
Date of the incident:[protected]
Description:a charge of rs. 885 has been issued on my bank account by the name of debit card annual fee without any notice of the same. My card is a normal one and this is the first time that such a charge has been issued. I am trying to reach the customer care but unable to do so. Phone banking is off and the complaint i registered with the bank online has not been responded on. Help me know the reason of such transaction