port from cell c to telkom

i have been trying to call Telkom to port my mobile number to them and they keep asking me for a unique authentication code, like really? how do I have that code when it's my first time calling them? if it's not that when I try doing it online they keep telling me my sim number is incorrect for which I am sending them a number written on my sim, please can they try to make their systems user friendly or just say that they don't allow business from anyone mxm...