Fiber internet constantly dropping

I am at my wits end with this.  I have had service since Aug 9th of this year.  First they accidentally cancelled my service because installer did not close ticket.  Five days to get my service back on.  Then my service went out completely after another month.  They first told me I needed a new gateway.  Received the new gateway.  Installed it and it would not activate.  Do the tech chat again…now they say it is the line.  Schedule an appointment for 4 days later.  Wait all day tech never shows. They let me know at 11pm that they would not get to me that day.  Finally 2 days letter tech comes out.  Turns out someone unplugged me in the fiber box down the street probably while installing someone else.  Get that figured out.  Internet constantly dropping like every 20 minutes.  Another tech comes out.  Checks everything.  Checks my mesh system everything set up fine.  He assures me my problems are over.   Still dropping connection 20 times a day if not more.  So I have had 4 techs, 4 boxes and terrible service.  I have tried calling support, but all that does is make me madder.  Every time they run a test or I run a test with the app every this is just fine.  Looks like it is back to Xfinity if I can’t get this solved.