Terrible WiFI - Lying staff?

OK< senior citizen here.  Was on the ACN program where I paid $10 a month.  The program ended, now the SAME service is costing me $59.99. Irrelevant you say?  Should be, but the minute that happened, my internet went from being ok all through my house to 1/2 the signal most of the time.  If i use my microwave, I loose my tv and my laptop.  Buffering wheels come up, things lock up.  Not only that, but my second floor bedroom tv doesn't work, EVERY night.  If I get a picture, i get no sound.  If I get sound, I get no picture.  Or I get the buffering wheel, and endless circle with a zero in the center.  My modem is, at the most, 30 feet from all devices in my home.  I could be getting internet in my kitchen, but nothing upstairs.  I'm called several times.  i do not appreciate getting lied to by people who claim they are going to monitor and email me and they do nothing.  I do not appreciate people telling me nothing is wrong, and everything checks out fine.  While on the phone I have a full signal on my laptop.  I hang up - guess what?  Everything goes down, I have a 'you are not connected to the internet' message on my laptop. I shut off, I turn back on, SEVERAL times, and finally get it back and what do I get?  The half power I usually have.  The last person tried to sell me an 'internet booster' for $10 a month!  The one before blamed it all on the fact I owned the modem and I should rent one from them.  See the game they are paying?  They have no competition in our area - so they can do whatever they want.  I wonder how many people they are soaking for these additional devices when they should just stop messing with the service???