Digitial Voice should rest in peace

Am I the only person with Digital Voice issues at Comcast. Since May 2009 I have reported numerous times QOS issues with my phone. The call will start fine and the listeners will report they can not hear me. I am forced to stop speaking and restart the call. Three times level 2 technicans have investigated the problem. Comcast will close the ticket and walk away without me acknowleging success.
The latest trick from the customer grave yard is to not record the ticket. This happened tonight with a promised call back from a supervisor. Denial a call was ever made. After esculating the issue, a call center employee offered $25 credit for the trouble. Sorry my time is worth more...
Is the devil at comcast worse than Verizon? Comments and suggestions?
Thanx...