Amazon — Laptop cooling fan

I had Ordered a Laptop cooling fan from AMAZON.IN with order #[protected] on 10-MAR-2021 which i successfully return on 14-MAR-2021 and since i had paid by debit card, the amount was supposed to be credited in my bank account which did not happen till date. I contacted the AMAZON team which replied me back with a reference number stating that they successfully initiated the refund process on 21st itself and its up to the bank to credit the same in my account in time which can take 5-6 Business days but since it has been longer than that i called my bank with the reference number that my merchant gave me but they refused to help saying that this of no use to them. My account number is [protected]. I regularly check my balance, nothing of that sort has been credited since then. My refund reference number is 30005110691069148570284. Attached is the email from the AMAZON team stating that the refund has been successfully completed.