Amazon India — Refund not received in bank account yet Amazon shows return received status

I ordered a mobile phone One Plus Nord CE2 5G on Amazon India on 19th Oct 2022 and added my old phone for exchange. However, the exchanger refused to take the old phone and cancelled the entire order on 22nd October. As a follow up, Amazon initiated a refund on the same day. As per the guidelines, I should have received the refund in 3-5 business days in my original bank account, which ends on 29th October. On 1st October, Amazon updates the status as "return received", while the Branch Manager of SBI (my home branch) declares that they have not received any such amount.