Hyderabad Metropolitan Water Supply & Sewerage Board [Hmwssb] — Being billed for water connection that is not being used

I am living in Hyderabad Kothapet area 500035.
I have been living in my house for almost 7 years and from first day, I have not used the water connection as we never got water out of the line.
We complained about this and the water board said that a guy will come and check my connection which he did and said the water would come the next day but that never happened.
But we never bothered with it but we are being billed 220 every month and we paid that bill even without using the service.
We complained again for disconnection so we do not have to pay 220 every month unnecessarily but no one responded and my bill is showing as 8000 and when I am trying to raise a complaint online, it says that I have to pay the dues.

Note: The bill is 220 per month as my house does not have a occupancy certificate which is another story pending since 4 years.

Could someone please look into this and let us know how to proceed to get my connection cancelled and get my bill nullified.