Internet Installation/Extender

I cannot even believe how I have been treated as a new customer!  If I can find a different service at my house, I am returning this!  When I signed up, no where on the site did it say you have to have previously had cable in your home, which I did not.  Then when I called to set up the internet, the customer service rep told me six times, yes six, that I needed to plug my coax cable into a telephone jack.  A circle into a square.  After I could not get somewhere with her, I asked for a supervisor.  To which she told me someone would call me back.  No one ever did.  The next day I called back and they said they would send someone out to install it but it would cost me $100 and I was like um if I had known I needed cable I would have done something differently, can I please have a supervisor call me and they said someone would.  No one ever did.  Finally a technician came out and installed it, where it was most convenient for him, near the kitchen (not sure why someone needs internet near the kitchen) and I now only have internet in three rooms of my home but you want me to pay full price for internet which I am not receiving.  Now, the tech said I would need the extender and to call them and they would give it to me.  After talking to 2-3 people and telling them the tech said I would need this, not to mention it said on the equipment ordered I would receive it if applicable, to which it is because I am only receiving 10 mbps in my bedroom, I have screenshots of this and the tech put in his notes this was needed, I was told I would have to wait 14 days and then told by another person in Jamaica that I would have to wait six months to a year.  Someone told me I could drive to Jacksonville and go buy one but why would I buy one when I was told it would come with equipment (if applicable)?  I also asked to speak with a supervisor and no one has called me back to date!  I am ready to get another company!  This is how you treat new customers?  Someone did email me and I told them what happened and I never heard back!  This is terrible customer service!  I warn everyone about this now!  People at work could not believe how long I waited and how I was treated on the phone.  They even said I would not have that company.  All I want is the extender that was promised with the equipment I ordered online.  This is because I am trying to work from home but this is hindering me!