HDFC Bank — fastag not working

Address:

Th M 21 Naveen Nagar MDA Colony Moradabad, Moradabad, Uttar Pradesh, 244001

Hi my car no is UP21BX4623 and I have got this HDFC fastg at the time if delivery on 02/11/2018 and have recharged it on 4 Dec 2019 first time. But at the time of passing through the toll on 12 Dec 2019 it shows discontinued.
I have called many times on toll free no [protected] but it did not conneted and when i called on 1033 they said that they are not able to clarify what is the problem and for the same I need to contact with HDFC itself. So Kindly resolve this as soon as possible as I have already recharged and facing problem while passing toll.