Unverified Billing Suspensions are often Old Suspended AdWords Accounts
It may seem like a simple clerical error, but if Google can’t verify your billing info they’re not going to let you use their ad network. After all, they want to get paid too! Sometimes you’ll get this message for more complicated reasons.
If you received an adwords account suspension because of Google trying to verify your billing info it is for one of two reasons.
Old suspended accounts
The first reason is because you might have another account you have previously used and Google has been able to link your billing information […] Read more