Same here ,I have not got any credits from the surveys either...
Downer ,use one hour or more on the survey "TOLUNA" and no credits arrives from WGT (as it says in get credits) it was more than 1000 credits i am still waiting for it..
Now when i go to "take suvey" i have this on screen : ( We're sorry, there are no options available to earn Credits right now. We have new options available every few days so please check back tomorrow ).