Comcast Business Customer Service Stinks

I've had a frustrating few days trying to get through to Comcast Business Customer Service. You're on hold for a bit and then they tell you no one is there to take your call so you leave a message. No response. I've left three messages with them since. Here's the real kicker. I'm calling them TO BUY MORE SERVICES. I would think they would take a call from someone wanting to fork over more money but I guess not. Can't wait for FIOS to arrive...