Canara Bank — Amazon refund to my canara bank account was due 9th march 2021, still haven't received it.

I cancelled an order from Amazon for which the item returning was picked up on 3rd March 2021, on refund tracking it showed that the refund was initiated on 4th March. The refund amount of rs 620.00 was to be returned in my canara bank account no.[protected], it was due 7th to 9th of March 2021. I have been provided with a Refund Reference Number[protected] by amazon customer service. I called canara bank helpline but they said that the bank could do nothing regarding this issue and it was a fault from Amazon's side. I am submitting this complaint on 19th March 2021. Hope i get my money back soon.