BAD SERVICE National Real Estate

I bought a Townhouse and National Real estate was the bodycorporate. After nearly two years I sold my townhouse. To my surprise I got my last statement showing the double deductions made on my account. Firstly they never read my water meter and charged me more than I have ever used and it was the new owners responsibility to pay the water usage seperate from occupation rent having a-paid water meter. They then also added R100 for stationary used and R1400 for clearing out figures. This is not acceptable for me I am not stingy to pay the new owners water but making them aware that I have sold my property and that they must take in account that the new owner is responsible they now just take the funds like they please. The geyser also burst and I was never contacted but then they fix and send me documents from Hollard to complete. I am not at all comfortable how they choose to work and just spend my money.