Poor customer service

I haven't had a dial tone for 2 days and went to all the troubleshooting as stated. I called Comcast and spoke to a representative about the urgency of a dial tone due to medical needs.  She gave me an appointment for the next morning of 10/25/19 from 7:30 to 10:00 am.  I accepted the appointment and had to cancel my previous commitment for that time allocated. Turns around and received a text message to confirm my appointment for 10/26/19 from 12:00 to 2:00 pm.  As furious as I became I called back and they had no knowledge of my appointed time. They offered to put me on a waiting list, are you freaking kidding me!!!!  I demanded for them to pull the tape of my speaking to Stella and no Stella was around. I requested to speak with the supervisor and he, Joseph told me that he will call me back at 8 am. What kind of fool does Comcast take people for? If my appointment is from 7:30 am and he wants to call me back at 8 am, that's surely a brush off tactic.  My cell phone is not a business phone, I pay a bill for the Internet, TV, and phone and my cell phone is not on this bill and no one has this number for my transaction.  3 days without a dial tone is unacceptable and I demand to hear the conversation I had with Stella if there is any such thing.  If a crisis should arise and my line is not back in service i will be holding Comcast accountable and seek legal representation.