Amazon India — Refund not received even product has been given back to amazon

Address:

GOYAL HOUSE, 9-A, OLD SHANTI NAGAR, MODEL TOWN, PANIPAT

Sir I have ordered for a mobile cover on 01.06.2023 and received order on 05.06.2023 by paying Rs. 160/- But as I opened it was not as per order because order was for blue colour and it was of pink colour So I requested to refund back the order and on 06.06.203 I returned it to the courier boy and waited for refund but not got refund of my money paid. When I contact on your customer-care they told me that the product is not received to supplier. Now my question is when I returned the product and courier boy has informed you that he got back the product then what is my fault. I request you to refund my money of Rs 160/- as this type of inconvenience and behaviour is not expected from such a big online shopping platform.
My Amazon id is [protected]
Namish Goyal