Woolworths gift card ****!

I recently received a message with a link to woolworths at http://woolworths.com-rebajas.net/en-za/ which said: "Dear visitor you have been selected to take part in our short survey and get a free R1,500 Woolworths gift card!" I answered the questions, shared the survey with friends and it kept sending me to more surveys asking for my phone number, email address and other relevant personal information but I never got the voucher. I basically gave them all my personal information and got nothing for it!