National Highways Authority Of India [NHAI] — HDFC Fastag - Car Regn. No. Updation. Useless service by HDFC

Dear Team
HDFC customer id[protected]
Vehicle MALB251CYMM158664
For my new car, the dealer purchased HDFC Fastag & he charged me for the same.
As it is new car registration, the card was issued with Chasis number.
I would like to update the car registration number in place of chasis number.
I have been following up with HDFC Helpdesk for the same. As per their advise, my email id needs to be activated first & then the registration number can be updated.
I have been following with them since long. Initially they informed me that I will receive call for email id confirmation. This call was received by me after lot of follow up & when I escalated the matter.
Now the activation of email id is pending. I'm following up with them continuously. Everyday the helpdesk executive is telling me that it will get updated shortly.
Can you please escalate the matter with HDFC officials.
Also please be informed that HDFC Fastag customers are facing issues in recharge as well. Their system is very slow & it takes lot of time for verification & recharge.
Also please let me know if I can change this to ICICI Fastag.

Regards
Milind Rakate
[protected]
[protected]@gmail.com