State Bank Of India [SBI] — Refund not received in account from Amazon

My name is Uttara Borgoyary and I ordered Boult Audio AirBass PowerBuds on Amazon on 20 April 2022. The seller cancelled the order on 27th April 2022. And on 27th April 2022 Amazon initiated the amount to my card but I still didn't get the money. Amazon sent this reference number ONUS20220428 and told me to file a charge dispute but SBI doesn't have such a policy. So please kindly respond to this complaint, it's very urgent and it has been almost 2 months.