Paytm Mobile Solutions — Regarding money not added after applying promo code of e-gift card

Address:

2276 gokul colony papade wasti hadapsar pune 412308

Respected sir,
My name is Vishal mohite recently I added 500 rupees to my paytm wallet by add money by applying promo code of a paytm cash code gift card and I got message that promo code applied successfully cashback of rupees 500 will be credited to your account in
24 hrs but still after 2days my amount is not credited I have called customer care executive but she refused to help and said there is no any department to solve this query after that I tried 24/7 helpline through paytm app but there also this problem is not listed paytm doesn't help me any more to get my money please help me