Complaint Review: Mediacom Cable

I have never been so upset in my life with the poor customer service of this company.  My internet hasn't been right since they installed it.  If the technicians show up on time, they never know what they are doing and are guessing half the time.  If they decide not to show up, they lie about calling.  This is not an accusation...its a fact.  I had an appointment today between 1-5.  The technician never called, never showed up.  At 5:15 I called Mediacom to find out where he was, at 535 I got a phone call I couldn't answer because I was on hold.  I was then told that they had tried to call twice (LIES!) and that now I couldn't be seen for the internet issue I have been trying to get cleared up since they installed it.  Additionally, they keep trying to hang an overdue bill on me that doesn't exist.  Every time I get notified, I call and get told that its a mistake, but then I called again or told I can't do something because of this overdue bill.  How after three weeks of a billing cycle do I have an overdue bill?  Why does no one at Mediacom know what they are doing.  It ties my stomach in knots just talking to these people.  Delete my post if you want too but I will be complaining every where I can until I can get some competent service or until I can find someone that actually appreciated their customers because it is clear that Mediacom DOES NOT!