I ran a lead gen offer with a network last month and I was just informed today (3 weeks after sending leads) that 25% of the leads had 'invalid' data. For the type of offer, I believe this simply means the lead was actually good but did not convert on their end. The leads were 100% compliant email traffic. This is costing me x,xxx and im not happy to find this out. Has this happened to anyone else and any advise to get some of those leads credited?