Indian Bank — refund not issued by the bank

My refund was processed from amazon on 19th jan 2019 and it should have been reflected in my account at most by 24 jan, but i have not received my refund of inr 698 rs still. I called the indian bank customer care number but they refused to check the refund reference number issued by amazon and also they refused me to file charge dispute form, moreover the online complaint system is also not working nor i am able to file charge dispute form, i have also called amazon customer service thrice and they have assured me that the refund is processed from their side on 19 jan only, but the bank is not cooperating me.