Row house housing society

We have a unfinished villa in a row house. Completion work was stopped due to husband's death. Due to financial constraints construction work was stopped. Now after nearly 20 yrs later we intent to accomplish the villa construction. We have been paying regular property tax till date. We wanted to connect our water supply line and sewage drain lines which are just outside our villa in center of row house access road. We tried to find out if any society incharge is available, to notify them about such utility connections. We did come across one person who claims to be secratary. He said that we can proceed with connections once we pay the society dues. So we ask them to provide the bank details and the due amount. And we ask them to provide the reciept for the payment that we will process. But they demand that we pay half the ammt in bank acct and balance as cash. Later i realised that the society has no registration certificate or any registration nos on society letterhead. I believe society is not registered. I have not made any payment yet. Can an unregistered society claim such amt and refrain us from connecting the water supply inlet and drainage lines to and from my villa. My property tax documents seems to be charging us for water, drainage and street light facilities. Can society deprive me from accessing my basic requirements without settling the amt they claim.