Tamil Nadu Electricity Board [TNEB] — Billing incorrect charges

Address:

F2, PLOT 115, 4TH MAIN ROAD, SWAMY NAGAR, MUDICHUR, CHENNAI - 600048

March '20 bill (320) was settled, then may month bill (320) was settled without reading details as per amount mentioned online (I. E, the same amount of march'20). Now the reading was taken from march to till july end and invoiced (650) without deducting the may month amount. So i have to pay 320 extra which is incorrect.