Free zp?!

I've completed something about TOLUNA. It were alot of questions and I were able to complete it. I also did confirm my e-mail adress. And I've already waited about 30 minutes!!
I don't have any more ZP while I still did fill in all the questions... I've tried to do them again, but then I get this message:

Sorry for the inconvinience
The offer you requested is no longer available.


WTF?!?!?!?!?!