Flipkart — Refund/voucher code not received

Order Id- OD[protected]
Product selled back- Samsung Galaxy j2
Amount to be received- Rs1500

Under flipkart sell back program, I sold back my Samsung Galaxy j2 handset. The delivery boy picked my phone on 12/08/2022 and handed me a packet, which only had a card and nothing else(not a code to be redeemed). The card said I will receive my payment within 24 hours but i haven't received my money yet.

I called for customer help but they always say we are helping you, your complaint has been forwarded and such other statements, not actually solving my problem.

I request, plz look into my case. Thank you

My [protected]@gmail.com