State Bank Of India [SBI] — refund issue of online shopping in amazon

I ordered a product from amazon online shopping. I returned the product due to some issues. The refund was also processed by them. But the refunded amount doesn't reflect on my bank account. The refund amount is around 499/-. I ask the bank customer care for help. But they didn't provide any help. Refund reference number was also given to the bank customer care. They are not considering my need. Please help.