Mislead on referral promotion

They mislead us into signing up to this promotion, I signed and never recieved my R500 reward to register and sign up, I bought ZAR shares then I was later told it has changed that I had to buy forex shares and this was only after I had complained about not receiving the R500 they have mislead us, highly disappointed in this, the Terms and Conditions do not state that you need to purchase Forex shares or international shares in order to qualify it states that you need to buy shares.