ICICI Bank — fastag not delivered after 15 days (ordered on 24th nov-19)

I ordered one fastag from icici bank for my car on 24th nov-19 and paid online. On last confirmation page, it was mentioned that it will be delivered to your dispatch address in next 8 days. But i did not received it after 15 days also. I tried to contact them over[protected] since last 2 days but not able to contact any service representative. Whenever i tried to contact, i always received either busy tone or all service representative are busy with other customers. Many times i hold call for 30-40 minutes but nothing happened. They don't email address on site to inquire about the card delivery.

My other friends, ordered same on paytm on same day and they received in one week.

Now i frusted and need to refund amount, so i can buy it locally.

Please help me getting refund of rs500 which i paid initially.