Mahanagar Gas — Bill amount for Oct'20 is way too high

We have always get a bill around INR. 600/- but this time for Oct'20 it has gone to INR. 1, 740/-. We know that it wasn't used extensively then why such big amount for current month bill payment ?
My CA number is[protected]
BP : [protected]

I have also sent a mail to them regarding the same. Please note in current slowdown, job loss and COVID pandemic each penny counts a lot for all retail customers.

Regards,