I reported when i didnt receive some credits and got this reply
Whenever you notify us about an issue with a survey or offer, we make every effort to mediate with the offer provider or research client on your behalf. Sometimes they are unable to verify your eligibility for the reward, which is why you are not receiving credit to your account. In some instances we are able to make exceptions, but we cannot always reach this resolution for every request submitted. We work hard at identifying broken offers and surveys, so we appreciate your write in and bringing them to the attention of our partners
I must admit it gives me very little confidence to try out some of the things you have to pay for