I'm not satisfied with their bad service

I'm being over charged for things I don't know. I pay 3100 including water monthey but now to my surprise I have to pay 3706 that I've never been informed off. Were do I get such money because I didn't even know fixing my door will cost me so much I was just gonna leave it they didn't even tell I'm gonna pay they just put it now in my bill letter. Please assist this people are ripping us off like nothing. I was never informed of extra costs