Airtel — waiver of late fee charges

Address:

Satara, Maharashtra, 415002

I am a regular user of airtel postpaid mobile services. Monthly payment of the bill is done by way of standing instruction carried through bill payment facility provided by the bank on its portal whereby the bill is auto paid from my bank a/c. This process was smoothly running till last month when i was informed by the bank that the said si could not be executed in the month of oct. I was out of station when the due date of the mobile bill needed to pay. When i returned, the bill was duly paid after just 2 days delay after the due date.in the next monthly bill, i was charged rs. 100 towards late payment. Need to know the procedure to request the company to reverse/waive the same.