Comcast Frustrating Customer Service

I just subscribed to Comcast on their $29.99/month promotion for 12gb. I thought it was a great deal and so I switched to their service. The first issue I had with them was when their first scheduled installation did not arrive in their specified time frame at all! Then I got my bill claiming that I owed them $190. Of course I thought it was some simple mistake, but as you have probably read, Comcast customer service department is HORRIBLE and I had to wait for a long time to speak with a rep. All in all, it has been so frustrating dealing with Comcast!