North Eastern Electricity Supply Company Of Odisha [Nesco] — Bill Amount is so high

Address:

At-Bodak, Po-Sathibankuda, Via-Aradi, Dist-Bhadrak

Generally, my electricity bill around every month is less than 300 units.
but for the bill period march 2021, my bill unit is 947 unit

I purchased voltas 1.5 ton AC on march month and I have expected my bill should be around 400 units
despite that, it comes 947 units. my AC consumes very little electricity.

what is this?

please find attached the bill.