Hey Bonus i had the same problems with them and finally pulled most of there banners and links last month , and have a few more to pull when i get time.
I sent them an email asking that they check my links and see who i referred and they said it cannot be done then told me to promote them more and thell give me a higher cpa ,
I never saw i sign up in the past few months after sending hundreds of quality targeted clicks , and these are good clicks coming from search engines to my site searching for specific sites ,
So actually this whole program is the first program i blacklist , the entire operation ,