HDFC Bank — no response for fastag application for a month

Address:

Bangalore, Karnataka, 560037

I had submitted a fast tag application one month ago via gdfc site.
I have got no updates about the fast tag registration. I have got an email confirmation from hdfc saying that i will get fast tag in 7 working days.
But it has been almost a month, but i did not receive any wallet number till now.
I called fast tag customer care multiple times, but they simply asked to wait for a week. Is there a escalation point where i can reach out to? How do i get the fast tag delivered? If its taking further delay, i want to cancel application and get full refund.