Paytm Mobile Solutions — Paytm postpaid late fees issue

I have to pay my due till 7th of feb and i paid 7593rs after after 1 hour of due date and at the time of paying my dues there was no late fees but when i paid after that paytm charged me late fees of 885rs which was not in my original bill so i want to request paytm to waive my late fees which is illegally charged on me
Name pratyender kumar