HDFC Bank Fastag — not received fastag instead of making payment twice

I had applied to hdfc for fastag on march 1 with application reference number hfr 106699 and made a payment of 500 rupees. They sent me a mail to send aadhar which i replied to but i didn't get my fastag.

Again i applied for the same on nov 12 by making another payment but haven't got the fastag still at my address.
The customer care number is either busy or not attended to.
Never expected this kind of service from hdfc