Yoco referrals program is a ****!!

Yoco Promises R500 when you refer a friend, and your friend signs up and buys a card machine using your link that you sent to them. They also say that your friend has to make over R1000 in sales for you to get the Promised R500, how ever they do not pay this amount to you even when all their requirements are met. I tried speaking to their support team but they refused to help. They said I should send them emails and I did but no reply on any of my emails sent.