Indian Bank — refund has not been processed

Name: shikha kadian
Acc :*2617
Mobile: [protected]
(Refund reference number) for the transaction is[protected].
Bank - indian bank

I have purchased t-shirt from my friend preeti saxena's amazon account by making payment of 6, 99 through indian bank debit card. I have returned the item and got the mail that the refund has been processed successfully on[protected] and the amount would reflect in my account by[protected] but it is still not processed in my account. I visited branch for solution and they contacted billdesk which is the payment gateway. Bill desk is asking to get payment reference number from branch for which branch has no answer. When i contacted amazon, they requested to file charge dispute with indian bank customer care. But indian bank customer care executives denying the existence of such form/facility. It is not about money but about the customer services offered by bank. It is the practical issue and may happen again in future for which bank should be ready with solution.

Kindly resolve the issue