Indian Bank — I order sonata watch on amazon. and I cancel that order and I request for refund from indian bank

As i have ordered a product from amazon and cancel it and amount is debited from account so there was refund amount initiated from their end on 30.11.2018 and the reference no is:[protected] but amount has not been credited in my account till late and continuously i am contacting customer care for this but not getting a reply for this. Please look into this matter as its very serious.