Bill-credit - mobile

This all started in Oct when I called about my bill balance (big mistake) I apparently deleted my emailed invoice.  The Representative I spoke to immediately wanted to tell me about improved plans. I mistakenly listened and agreed (big mistake) he told me I would need a new modem, ok so I was sent one. I couldn’t get the cable loosened so I called back. The rep said service person would come by -no charge-and connect the modem. A very nice young man came.  So I told what my bill would be I paid next I get a bill for 234.00 this was deducted from my bank account I DO NOT HAVE AUTOMATIC DEDUCTION. Again I called after much conversation and holding an hour and a half later I was told I had been double billed and they would credit my account I said no you took it out of my account so put it back in there.  It was agreed- after that I received several notices that they were working on it. Last Friday I had a notice that the refund would be within 24 hrs. it’s now Tuesday and according to my calculations that’s way over 24 hrs. 
THEN I get an email bill for 54.00 mobile. Again I called, another hour conversation.  I DO NOT HAVE MOBILE SERVICE WITH XFINITY.  So I was told it was fraudulent and they would fix it.  I keep getting emails that I’ve used gigs  again I do not have mobile service with you. 

Why is this difficult??  And you are sending me text asking me to fill out a performance inquiry about efficiency grading and if I would recommend Xfinity - what would you do??

one helpful suggestion quit  having rep use scripts. 
I have ticket # [Edited: "Personal Information"] - mobile

ticket #[Edited: "Personal Information"] - credit 

I am 88 years old don’t need this aggravation.