Water supply cut off

We live in a building society where builder hasn’t handed over the property yet( after the completion of building 23 years ago). Some of the residents made a committee of their own ( without consent from more than 30 percent society members- including us) to collect the monthly charges to pay water, electricity and other charges. The members who don’t support this unauthorised committee have decided to stop paying maintenance fees until an unbiased committee is formed( 4 out of 6 committee members are not stakeholders of the society). Now, the residents committee is threatening to cut off our water supply. They have started defaming our names by writing the unpaid accounts on society notice board- where the accounts are inaccurate. No personal notices have been served. We are willing to pay all outstanding accounts in return to our representative in residents committee, but they don’t want to do that. Can they actually cut off our water supply? Can we sue them for defamation as they are asking for more money than our outstaying dues( our dues are 5400 and they are asking for 8800- no answer supplied when asked about it)? Their behaviour gives mental trauma to my elderly retired parents. Can we take help from police dept? Thank you Kind regards