Delhi Jal Board — Wrong bill k no [protected]

I have recently got my connection restored after a long period exceeding 20 years.
The meter installed on 9.12.2020(confirmed by djb) and there was zero reading in it, after which my supply was commenced.
Prior to that my reading was nil, and i had paid restoration charges of rs 255/-.
To my utter shock, i have receive a bill for rs 387/- for the period 19.11.2020 till 08.12.2020.
My K no is [protected]