MoneyTap — charged me extra in moneytap card

I have taken moneytap card. And i have taken 100000 from this card as a emi. I was paying emis regularly. But recently they are charging finance charges apart from emi amount. Because of this wrong calculation i was forcefully need to pay 2200 rs/- unnecessarily. This is causing me to pay extra than the agreed interest rate.

I have mailed money tap mentioning the same. But no reply from moneytap team.

Can you please help in resolving this issue.