They terminated our adwords account saying that there was something wrong with the site it was advertising and giving a list of 12 extremely general things which might be the problem, none of which seemed to apply.
They also provided no way to respond or get in touch with anyone at all. Their advice was "fix whatever you think may have been the problem and try again".
This wasted a huge amount of time as we tried everything possible to fix the issue to no avail: they never said anything had been fixed and never sent more information.
Finally I got a contact at Google. They looked at our account, said it seemed to be a glitch, and reenabled it.
That's no way to do customer service and is one reason why I think Google should be broken up, if only so that each part is smaller and feels the need to be more accountable.