Tamil Nadu Electricity Board [TNEB] — Excess billing wrong calc

Hi my coonection no.[protected] and in domestic tariif with bi monthly billing. Yesterday meter reading got and it's somewhere around 300 units and 580 should be bill.

But the unit consumed was calculated between March 2021 to July 2021 rather than May 2021 to July 2021. Hence unit is 800 and bill is 3600.

Need corrective action for the same.