I wrote two weeks ago about Google cancelling my AdWords account. Since then, Google responded to my announcement of cutting off their payment. They sent me an email that apologized for my frustration and said, "Enter a new credit card number, and your account will be reactivated." I was skeptical, but tried it. After two days with the new number, the account was still not reactivated.
I sent another angry email that questioned whether they were even reading these emails properly. Finally, they responded saying the account had been reactivated, and indeed it has. So far, it has not been shutdown again.
So in a way, it is a happy ending: my ads are running, as I wanted them to. But I still never got an answer about why the account was closed in the first place, and it would have been good service for them to say something like, "We're sorry for the mess-up, here's a week of ads free." At the very least, they could have admitted it was a mistake, and apologized. So I'm reserving judgement on the whole experience.