Distance question

I live 4 miles from my wireless outside antenna broadcast...my internet service providers who have suggested that I raise my antenna above the trees in the distance I have now...when I raise my tower 25 feet they have NOT promised me that raising my tower will help my signal...these guys are real rear ends and I cant say the word I want to use...I was the first customer they have on this antenna...now they have 17 customers and they I was screwing up everyones else signal by having a tress slightly in the way....are these people giving me a line of crap....also they shut me off...I have had no interent for two weeks...is 17 customers off of one antenna alot of customers....I need some help here men