Cancelled Service Appointment - Why?!?!?

I have been having intermittent signal issues with lower-than-expected internet speeds. I've checked the cables, and restarted every piece of Xfinity equipment in my home multiple times. Earlier on Wednesday, I chatted with an agent and explained my issues and had a scheduled appointment for a field service technician. I received the SMS message and emails confirming this appointment. I also received multiple phone calls from additional agents who I explained that I still have the problem and need my appointment for Sunday 1-3 pm.  Today I get a get message saying my appointment was cancelled?  Why are you doing this to me?  This is so extremely frustrating and disappointing.