Swiggy — Refunded coupon is not working. No one responding.

Order ID:[protected]
For this order, your support team has given coupon GOODWILLT275 worth Rs. 275. The given coupon is not working.
I am sending emails regarding this issue 60+ times. But no one is responding. I don't know how many times I need to send emails regarding my issue.
It's already 13 days. Still, my issue is not yet solved. I contacted your escalation team, chat support team, social media support team, and email support team no one is responding. Is this what Swiggy standards are?

Really very very worst support team and cheating customers.