Hi,
We have experienced some quality issues with your traffic. As a result we will have to hold your payment till we figure out which leads are fraudulent and which are not. Once we're done with the checking, we need to revoke the invalid leads. We usually receive the quality report from the advertisers in the beginning of each month. Once we can decide how many leads will be revoked we'll release your payment. We'll try to resolve your issue as soon as possible. In the future please try to take more care of your traffic to prevent these type of issues.
Best Regards,
Ultra Pay - Abuse
http://www.ultrapay.org