I'll bet they weren't canned, they just ran through their contracted time. Anyway, I wouldn't use MCI if they paid me. Personal matter: years ago they offered something like $50 if we switched carriers. We did and they never ponied up the $$$. Came up with all kinds of excuses why not, then offered to give us the rebate in long-distance service instead of the promised cash. We dropped them on principle, and every time their telemarketers call, we tell them why we won't be going to MCI.
Of course, with the Danny Glover thing, it's even easier not to go with them, and they give us an extra reason to tell off the poor telemarketers.