Airtel — late payment charges

As i am paying my bills promptly before due date mostly i could not be charged the late fee. Sometimes net connection problem occurs and at that time i was unable to pay on due date. I request you not to add up the late payment charges in my next bill. Two months back really i forgot to pay and the next month i paid my bill with late fee only. Hope you will do the needful for me in this case.
Thank you.