Calcutta Electric Supply Corporation [CESC] — high electricity bill charges

I would like into bring into your notice that the electricity bill which has been generated for the month of march is unduly high. I have been billed for an amount of rs 3420 including the taxes stating that the energy consumed is 498 units which isn't a correct figure. I haven't been using the acs. It's only the lights, fans, a laptop plugged in for around 8 hours sometimes.

It looks like that the amount which i have been charged is keeping in view the last years amount for the same month.

Kindly take a look into it as early as possible.