I had similar experiences. Also when I last used Yahoo they had a "minimum spend" restriction, which meant that if they were unable to find you enough traffic,

I had similar experiences. Also when I last used Yahoo they had a "minimum spend" restriction, which meant that if they were unable to find you enough traffic, they'd charge you any way!!?! I closed my account after a couple of months of them charging me because they couldn't deliver enough traffic. You should definitely always contact google by phone though. Email never works well.