The Great Australian Survey are spammers

I signed up with the Great Australian Survey (www<dot>aussiesurveys<dot>com<dot>au) to see where BetterDeal were mentioned and I started getting the usual crappy offers from them. Kind of expected that, but the emails had an unsubscribe link at the bottom. I've clicked on that twice now and ticked the relevant boxes on their site but I'm still getting the emails. Either they are completely incompetent (why on earth are they sending emails to a .co.uk address anyway?) or they are spammers.