State Bank Of India [SBI] — refund of 39, 999/- rs not credited in my account

I purchased a one plus 6 smartphone from amazon.in and at the same time an amount of rs 39, 999/- rs deducted from my account but due to some reasons i returned it back and amazon refund my money 39, 999/- rs with refund reference no. 337787 but the bank didn't credit it in my account. When i called to customer care in sbi they didn't give me any information regarding this. Then again i complain this problem on official site of sbi and they give me ticket no. [protected]. Help me regarding this.