Yeah yeah, that sounds great. The problem is, how do you verify some of Adwords' metrics and stats? There are so many ways that the service could screw up without you even being aware of it.

Even in the example given (where the OP could see a wrong telephone number), how could they know how often it had been shown wrongly, and how many people had called? Only Google knows (or could know). You have to trust them, but you cannot verify them.

Even if you come up with your own metrics to monitor Adwords, why would Google believe your numbers over theirs?