My internet has been out for a week

I am at wit's end:

I live in Northern California and on 3/21 our cable was cut during last week's storm.  I have been trying to get Xfinity to come out to repair the cable ever since then.  I've contacted support by phone, chat and I've even gone to the nearest Xfinity store.  I apparently have a service ticket (starts with ECM) and after one of the calls I also have an appointment (maybe with "Advanced Customer Support?") to come on site.

On 3/21 I was told that someone would be there 10:00am the next day (3/22).  No one showed up.  I've contacted Xfinity by phone or chat most days since then.  Invariably I've been told that someone would show up by end of day on that day or the next day.  But no one shows up; no one calls.

I really need to find a way to escalate this issue.  I am highly dependent on my internet service for work and I need to get this repaired as soon as possible.

PLEASE HELP!