I always used to buy this because it was cheap. I left my tub in JHB when i went down to Cape Town, so i bought another. It was a completely different product, the packaging was exactly the same, but it looked different and tasted different, and it triggered symptoms of lactose intolerence. They probably thought they could pass off some cheap whey concentrate onto the Cape'ies.
On a side note. Any product that says 100% whey is using false advertising. Whey is whey which is always 100%, you could have 1g per 100g but its still 100% whey.
McDonald's uses this as well with their 100% beef burgers. Again beef is always 100%, but this could only be 1% of the burger content.