Desperate situation

I have now devoted some 4 days to long conversations with Xfinity staff in an attempt to re-establish our internet connection. We have made absolutely no progress. Each representative starts from scratch, seemingly unaware or uninterested in the long saga that has preceded the latest call.  I would like a senior technical expert to contact me to review exactly what is happening here and resolve the situation. I am unable to work because of this breakdown in Comcast service.