[Resolved]  HDFC Bank — I didn't get my fastag sticker

I have applied for fastag via hdfc online with refernce number hfr660548 on 28 nov 2019. After applying, i got message stating that filled form pdf will send to your registered email, which i didn't receive yet.
After few days i got a message with my wallet id and customer id. So now i am able to login to site, but so far i didn't receive fastag sticker. I tried to call customer support - [[protected]] multiple times but nobody is picking the call. Then i tried to call hdfc grievance [[protected]] they make a complain on 19 dec and told to wait for 10 working days. Then after 10 days, i called them again same wait for some time. Again i called, they provide me pno email address [[protected]@hdfcbank.com]. I mailed 24 dec 2019 but reply to wait and reply to wait. Again i called then they provide me a no to call their seniors [[protected]]. They also told me to wait.
I am waiting from 1 month and even i didn't receive any call from any of the courier services.
I have 8 years of relationship with hdfc and never face such scenario. But for specific to fastag service this is happening. With this i am bit scared, how can i get help if i stuck in some toll plaza, as nobody is receiving the call.