Tamil Nadu Electricity Board [TNEB] — late fee

Address:

Chennai, Tamil Nadu, 600091

Consumer no[protected]
May 6 2019 my bill payment last date. I didn’t remember that date, so i open google pay to pay electricity bill, while it opened it shows bill due date expired, i shocked then i try open in phonepe also reflecting same, then i login to tneb to pay it shows sum of 400 extra - actual cost to pay 2374 but i paid for 2792, what the hell goes to government took late fee charge like rocket interest. What to do now, shall i raise the complaint - mobile no-[protected]