Ismart is unprofessional and **********

I stay at Unit 908 Randburg Square apartments for about 5 years now. All along I've been paying anything between R300 to R600 for my water bill. End of May 2021 I was charged over R2000 for water which escalated to over R3000 end of June 2021. I'm tired of calling ismart everyday with their unprofessional stuff. Can someone assist me amend the charges and credit my account with what is due to me because I'm not gonna pay anything this month otherwise I'm gonna have to take this to court because it's *****.....