Indian Bank — refund amount not the process

As i have ordered a product from amazon and have returned it so there was refund amount initiated from their the reference no is:[protected] but amount has not been credited in my account very late and continuously i am contacting customer care for this but not getting a reply for this. As per them as lodged complain . its still in pending no action is been taken. As per amazon they instructed to file a charge dispute but wen i am trying to get it done through indian bank i have been told that no such facility is not there. Please look into the matter at the earliest. Then again yest i registered compliant Please look into this matter as its very serious.