Amazon India — Refund not received in my bank account from 1.5 months

I ordered an weighing machine from amazon and I received it on 13 march but its size was too small so i returned it to amazon on 22 march 2022 they said that the refund will be processed in 3-5 business days according to them my amount(of INR Rs 899.00) was refunded on 27 March but it has been 1.5 months the amount isn't received in my bank. I have contact my bank more than 5 times they said that no refund is issued in my account.