HDFC Bank Fastag — hdfc fastag not responding over mail & customer care

Address:

122001

There was a fastag (Customer id[protected] issued to me by hdfc and i noticed that a wrong email id was updated and i dropped a mail on 14th oct and also made call to customer care. But after repeated reminder the correct mailing id has yet not updated and there is a 2.5% cashback is also not given for all national toll movements as updated on hdfc fastag site.

The customer care no. Either always be busy or not responding and also never received even a mail acknowledged from hdfc.