Comcast error, I have to pay. Outrageous service.

I signed up for the HD Plus Triple Play package bundle offer for $139.99, which included Free HD receiver and 150+ channels and HBO. This offer ended mid June, after I signed up. However, due to an error on Comcast's end, I supposedly never signed up for this package (I have the exact breakdown of the prices and monthly bill form the representative), and in between a MONTH of waiting for them to install this in my house, according to the reps I cancelled the phone line.
Now you're trying to charge me separate for everything and not offer me the $139.99 price for the first year because they don't have the "codes."
It is not my fault someone screwed this up and it is not my fault that it took so long to get a technician out to my house. I called 3-5 times a week every week since June 3rd and made 5 different appointments. I was never informed of this supposed cancellation nor was I informed that I wasn't correctly signed up for the Triple Play package after repeating myself every time I called in.

How do you plan on fixing this?
If I do not get the price I originally signed up for, I am canceling Comcast after one day of installation. Shortest customer time yet, I'd think. I have nothing remotely appealing me to Comcast anymore, DIRECTV has never let me down.