State Bank Of India [SBI] — Refund initiated from amazon but not reflected in my bank a/c

I purchased redmi note 11 pro plus with exchange and paid rs 15599 from Amazon on 24th August 2022 but i decided to cancel the order. they successfully cancelled the order and initiated refund! The next day 25th August i received a refund of rs 100 but the remaining rs15499 is yet to be refunded! Amazon provided Refund reference number - ONUS20220826. Please do something about this, today is 29th August and i am yet to receive the amount!