State Bank Of India [SBI] — Reference number initiated by Amazon but still not received the money

Address:

Patkura, At - Kanchilo , Po-Korua , Via - Tyendakuda

I have purchased a product from Amazon on 5.3.2021 and I returned it to Amazon on 24.3.2021. they sent me a mail with a reference number and advise me that SBI will credit the amount within 3 business days. But still the amount is not credited to my Account.