RBL Bank — late charges levied even amount paid on due date

Address:

500017

I paid credit card loan emi on 6th June 6667, where the due date was 10th June through NEFT, but he payment was not updated, so I called customer care no they told It will be updated till one week. on 15th June money was
transferred from RBL bank. Same day I paid the amount again. Now they accepted the payment and charged the late fee 1000/-. When I checked with customer care they told I have to pay late fee charges. From 6th June I called customer care many times I asked them should I repay the amount as it is not reflecting. They told not required. If their information was wrong then why I need to pay late fee.