Terrible customer services and lied to about being given credits

I had multiple issues with my need X1 box.   Spent hours with on line with live chat support.  Every time I was assured they'd solve my problem.  Worked for two days and would get stuck on the Welcome screen again and again.  I was given a $20 credit first... but it never came through.  I chatted with an agent a few days later while equipment was still broken and requested a $100 credit for all my troubles.  I received a text from Xfinity that I'd be given a $99.86 credit.   I thought...customer service problems credited.  Nope, the credit was never given.  Then eventually a local technician was sent to my house.   My plan covers free technician services, but guess what: received a $100 charge for that.   I had to call and complain and I finally got the $100 technician fee reversed.  But still no $99.86 credit that was promised previously.  So I called back again and complained and told the Xfinity chat agent more of my time is being wasted and I wanted an additional $40 for my time.   So almost $140 credit.   I have screen shots of my chat amd the chay ID and they assured me my future $330 bill would be $190 after the credit.   But the $140 credit still never appeared.  I then went into the Xfinity store and they told me this chat agents are not authorized to give credits.  Xfinity customer service chat agents are like the seventh level of [Edited: "Language"].  I was lied to over and over.   Promised credits and compensation, but nothing.  Xfinity and their chat customer service is extremely poor.  No notes or memos in my file about previous chats and promises.  Just terrible!!