RBL Bank — unfair charge for canceling an a fridge which was purchased under emi

Address:

Smart Engineering & Design Solutions, 3rd floor; SDF 17; CSEZ Cochin, Ernakulam, Kerala, 682037

Dear sir
Last month my credit card bill is rs.3416.11, but my last month expense are as under.

2nd july 2019. : rs. 1928 spent on amazon
3rd july 2019 : rs. 701 spent on amazon
4th july 2019 : rs. 498 refunded back from amazon.
So my net expense from credit card is rs.[protected]+701-498). Instead i got a bill amount of rs. 3416.11.

I have called costumer care number for clarification, there explanation was that in the month of april i have spent rs. 53090 with flipkart on emi scheme and i cancelled the order next day. This excess amt of rs. 1285.11 is because i didn't called the rbl bank and inform.
Kindly do the needful