Don´t know if its a glich or bug or something. Maybe they just cut the survey. IC just tried to get another key through survey from my ip at work. But when i go on www.dota2beta.net/ and put in my Birthday followed by submit i immiediately get a code.

and i can do this more than once.

didn´t wrote the dota support till now. not much time to spare ;)

maybe someone wants to check it out and comfirm if codes are working

That site not affiliate with the official DOTA 2 i think. This is from WOT:
http://www.mywot.com/en/scorecard/dota2beta.net

http://www.playdota.com/forums/517590/dota-2-beta/

Must be a scam.

My avast! is blocking this site - malware detected.

ouch!
Then i think OP better run a scan on his system before it went viral.

thx for the answers my avira says nothing hmmm

but i check it nontheless

Surveys = scam.