I've checked all the directories and they don't have a listed phone number. They're operating from a P.O. Box, so it doesn't look like they have a retail/store front location either. This looks like a small home-based business with a nice website.
If they don't reply to their email, my guess is they're no longer in business. The website is probably paid up for a year, so it will just keep running until the hosting service pulls the plug. Sorry for the bad news.
It seems to be a couple of companies in South Africa who sell pure spacer lifts, Stofpad and Wizerd. I don't have a clue if they ship outside ZA. Their webpages are not very informative, more like contact us for details.
Thanks for that, Styrman Karlsson. I found references to both but nothing too encouraging. My GV is new and, with the last one needing new shockers after eight years (I blame the wife's approach to speed humps), don't feel like replacing another lot this soon. I had been hoping there might be some sort of bushes you could slip in after jacking up the car, if you noticed a bad bit of track ahead. Cheers.