I have had the same problems that have also been reported by many others. The latest was Harris Polls,(245 credits). I e-mailed them after meeting all of their requirements and their prompt reply advised me to contact WGT not them.
I believe they have hit the nail on the head. As these problems have continued for years it is obvious that nothing will change unless WGT takes responsibility and intervenes with theses companies. I believe they should have done this long ago as WGT provides the links and I am sure they are being paid for each time a member completes an offer.
WGT should protect their members and nsure members receive payments due them, whether through the Sponsor or from WGT.