Mescom — electricity charges for the month of may 2020

Absorbent electricity charges for the month of may 2020 - rs.6474. While the average bill we were getting monthly was of rs.1300/. We have never got a bill of this huge amount.
On inquiring with mescom, they are rather saying that we have used the electricity and no help from their side.

Total units utilization for may-02-2020 to june-02-2020 is 774 units, bill amount : 6474/-
Total units utilization for mar-02-2020 to may-02-2020 units - 238 units, bill amount : 1999/-

Account id: 24000509

Attached is the screenshot for previous and current bill. Kindly help