I have completed at least 3 opinion surveys that were supposed to pay out 100 credits on each one, and I have not been paid. I have filled in the customer service page and clicked to send it back to them and nothing happens, the page just comes back up and I have to try resending it again and again.
This whole game appears to be a waste of time and it looks to me that wgt are as deceitful as the companies it allows to use this site and that they are all out to screw everyone for what they can.