I got nothing as well. I sent them an email about it. Here is their reply:
Thanks for your email. All those people who were sent the email direct and returned it have received their credits yesterday
We did have an issue, whereby the survey was posted on a message board - it was only intended for those who received the email - unfortunately we cannot credit anyone else who did not receive the email direct.
Let me know if you have any questions
Manager - InterPoker
Oh well....it was worth a shot.