SoftBallHits scam?

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Has anyone ever used the traffic exchange called SoftBallHits? Has anyone been paid by them? I've recently made an account on their website and upgraded. After upgrade I started to surf but when I reached cashout they said that they were very sorry but all the money gained after upgrade is paid. I did not surf before upgrade, that's the problem. I've told them this and ask for proof that I've surfed before upgrade, and they closed my account.