Crappy Tv service & no help from technical support

On Monday evening, my cable started acting up, which it has done before but usually fixes itself.  This time it did not.  I tried everything they say to do.  When I try to reset it through the app, it doesn't work.  (and the fact that I have to login EVERYTIME to the cox app is really annoying!!) On Tuesday, I returned the box, which I have done SEVERAL times before.  Hooked up the new box, same thing.  Just shows a single letter or something on the box and does absolutely nothing.  Contacted support, they couldn't send a signal because my box wasn't online or something.  So, on Thursday, I again returned the box and got a new one, same thing again.  Still technical support couldn't do anything, so had them send out a tech person on Friday.  He came & couldn't figure out what was wrong.  Said I needed some other type of box & he supposed to bring it today.  Contacted support last night, to see if I could get some kind of credit because I haven't had service for 5 days, after chatting with someone for almost an hour, then for some reason transferring me to someone else, I'm told they only give credit when there's a power outage.  
So, they know i don't have cable, it's something with their equipment & they have no clue what is wrong, yet they can't give me a credit for 5 days???  The fact that every time I have had to return a box (which has been a lot) that they don't even ask what is wrong with it, says a lot to me.  I think they know their equipment sucks & just don't care.  I am so close to getting rid of them all together for cable.  We have nothing but problems with them.  My bill keeps going higher & the service gets worse.  If I had another option for my internet service, I would change that too.  I am in Louisiana and have limited options for cable/internet.  I've been with them for over 22 years, and they still can't help me.