Money market account not to trusted

I received a link from someone saying that shoprite has a money market account and its easy to join beside joining u can refer people and earn R5 per referral to my surprise i refer people and dont get that R5 sometimes it will say erro what what when u register that person again it will say the person is already registered but didn't get reward, so im afraid if we can trust this shoprite money market account thing guys we must be careful