State Bank Of India [SBI] — amazon money refund not received

Address:

NSB ROAD RANIGANJ, Gonda, Uttar Pradesh, 713347

Hi sir i ordered a zinq mobile charger from amazon. But i am not satisfied with product so i decided to return the product. Return has been successfully done & amazon confirm refund too in 10july 2019. I got email where mentioned that my account balance should reflect within 18th july. They also mention there if i don't get refund within 5days call bank customer care they also give refund reference code which is "160878" but when i call sbi customer care they said amazon reference number doesn't working for them.15 days passed still didn't recived refund please help me to get back my money.