Incapable of managing, careless and just giving empty promises

This "company" must be closed down. They simply can't manage complexes. In October and November they messed the accounts for the whole complex. In January and February they messed my water bills, overcharging me. When I pointed to them, they ignored my mails, when I pointed again in few days, they sent me AGAIN wrong account. When I pointed to them the 3rd time with pictures and invoices how incapable are they, they gave me promise to rectify it in 3 days, of course again nothing. Now I have to do their job, for which I pay them, I have to pay them, I have to rectify their stupid mistakes and on top of them I have to beg them to pay the overcharge.