Amazon India — Payment not received ( payment went to an account that is already closed by me)

I had ordered a beetel phone on amazon and as it was not as per my requirement, I returned it. The payment was done in cash. I was given two options 1) the amount would be credited to amazon pay 2) the amount would be credited to bank account. I opted for amount to be credited to bank account. Even after waiting for few days as the amount was not credited, I checked again and realised that the bank account linked to my amazon account was an old account which I'd closed a few months back. When I contacted amazon they've given me a refund reference number and asking to contact the bank. But the bank says that your account is closed. Now, how can I get my refund?