Canara Bank — refund not come on my credit card

Address:

Ward no 26 dhantoliya muhalla dehri, Rohtas, Bihar, 821307

My name is sumit kumar and my mobile no is [protected] and and ref no is 0r8ud3tg0000k00bmpls and date is[protected] but amount not come on my credit card amount is 516 and it takes to much time but lastly i complain to you plese help us.. How much time taken by amazon torefund this amount this is very bad service by amazon compared to flipkart service is good by flipkart compared to amazon