Opened a ticket that was sent to tier 2 and no response despite being promised call backs

Opened ticket that was escalated to tier 2 friday. was advised 24-48 hour resolution. Ridiculous, but whatever. called in saturday and was promised multiple times a call back THAT DAY.  Imagine my shock when no one called. Called back in Sunday evening and was advised that they would escalate the ticket and there would be resolution from tier2 in 24 to 48 hours. I am stuck in the movie Groundhog Day.
Also, support wanted me to know they do not have a direct line to tier 2, all they can do is repeat the same mantra of "we will escalate and someone will call you".  Yes, it is more important that the customer knows the internal struggles of Comcast support than it is to effectively resolve issues.  The entire support process is set up so as to discourage customer calls and cause enough frustration that they just silently cancel and pay off their contract.