MikroTik devices are readily available, all of them.
So what might be happening is that local distributor is not making orders, just waiting for you to order something. They maybe don't want to stock items without knowing, what people need.
Don't just look at their catalog. Call or email them and tell them what you need.
You're using very vague wording `No one in South Africa has got stock`
Stock of what - What are you having a hard time findng? There are plenty 4011s, Audience, CCR, CRS. What are you having a hard time finding? Maybe the distributors just don't normally order what you're looking for?