Indian Bank — refund deducted money. money is deducted but not transferred

Address:

Karaikal branch, 609602

I have ordered a few items on Amazon and used Amazon pay to pay the items. My bank account is linked to my amazon pay account and that's used for payment. The amount was deducted from my account but the order says the payment has failed. While ringing to amazon customer care they say it's the payment gateway problem. How long does Indian Bank take to refund my money