Regarding maintenance charges of flat

I am living in a flat, I have gone for holiday during December [deleted] in returning my bike was damaged in the parking plot of the flat when I asked for the security guard or the association for the damage of my bike they said they don't know , and also they allowed to place other vehicles on my parking plot without my permission there is no cctv footage to show the vehicle owner damaged it or others and also they are asking for high water charges under a maintenance and showing false accounts of water usage I have asked them to give me the currect bill and will pay rest of maintenance charges and is going on for 10 months every time I am asking for the correct water bill and they are not responding and finnally cut the water supply and said that since you are not paying maintenance charges we cut the water supply and they also placed cement and sand bags in my parking plot which caused damage to my bike and am asking to remove they but they have not removed those bags what should I do?