You can either email them and explain your case, or call them directly to explain it.
My experience was that in most cases they were right, and in one they were wrong.
I have found the AdWords people to be very helpful in explaining why, and very forthright in acknowledging if they made a mistake, even to the point of putting a special note on my account.
My advice is to communicate. From my experience, I have a great respect for their customer service system.