Trouble connecting to the internet

I have been having problems for a couple months now with my cable.  It started with pictures pixalating then nothing worked.  Tech was out a month ago.  Said it was a signal issue.  Spent 3 hours working on connection to house and gave me a new box.  Now 3 days ago I got the pixulation again and then channel froze and now have the message that it can't connect to the internet, error RDK-03033.  So 3 days ago I spent a good few hours with tech support, plugging unplugging all that nonsense.  I told them what the tech said before, it was a signal issue.  They scheuled an appointment for 3 days out, last time it took 5 days to get a tech out.   Last night level 2 called and did something and said problem was fixed.  Things did in fact work for the 1/2 hour I used it.  They cancelled the appt that was scheduled for today.  Now this morning, exact same issue again.  I've spent another couple hours using the chat to try and get my appointment back.  I was assured by the guy last night that my problem was resolved but if not I could get someone out today.  Now after the 2 hours on line I am wait listed for tonight but have no set appointment that I know of.  Chat person quit talking to me, told me someone from the technical team would be in contact.  So far no one.  I have been a customer of Comcast for 30 years.  The service lately has been the worst I have ever seen.  I have cable, internet and phone.   Is there someone I can escalate too?   I will now be without cable again for another 5 days most likely.  With what I am paying it is unacceptable but there is nothing I can think of to do.