I have to agree...sometimes Comcast drops the ball.
We moved December 1st. I went online 3 weeks in advance to schedule the shut off/turn on date (Nov 30/Dec 1). Simple, no?
They came the next week and shut off the phone. then the cable an hour later. then the internet about 6 hours after that--after I was on Dh's cell with them for 5 of those 6 hours. Then they restarted the internet and phone the next day but not the cable.
Three days later, my cable is back on, but now it's on a new account and a new bill cycle. They charged me for coming out to turn off the stuff that I didn't want them turning off yet, and charged me for coming back out--twice--to turn on the stuff that shouldn't have been turned off to begin with.
On the day I'm supposed to be turned off, they show up---8 hours after the end of the service window. The day I'm supposed to be turned on---the tech arrives 6 hours after the end of the service window. And he doesn't have the right package. He finally installs the right package--takes him 4 hours.
My bill? They charged me for the nondiscounted package price, instead of the price that I was locked into for 2 years (had 1 year left on it).

Six weeks later, the price is finally corrected. I have a final bill on the old account, and new bill on the new account. I pay the final bill, pay the new bill (now 2 months worth--I wasn't going to pay them until they got the situation fixed. I put the money in the savings account.)
It only took 9 weeks from start to finish to get my service successfully transferred. And about 80 hours of my time.