HDFC Bank — hdfc rfid fastag not received

I have applied and paid for hdfc fastag in the month of jan18 and i got the message alert with my customer id & wallet id on 08th jan18, but still, i have not received the rfid tag and i am not able to reach the customer care number which is always in busy status i am not sure to whom can i reach to get the tag.

Application reference no. Is hfr022952
Customer id:[protected]

I have already sent an email to hdfc. [protected]@sahaj.co.in, but have not received any response yet.