HDFC Bank — fastag not received

I have applied hdfc fastag through online and made the necessary payment on 14/12/2019. The reference number of the application is hfr01089936 and i got the message that the fastag will be delivered within seven days and its been more than 10 days, till now no update. After repeated calls on the helpline number, finally got the representative but they also don't have any information. I am requesting the hdfc bank team to resolve this matter asap and send me the update regarding my application.