Showmax, rather Nomax through Vodacom

Is it so difficult to remove a number from one’s account? O my word, not impressed. Wanting to activate the showmax deal, but when I enter my current number, it sends an otp to an out of date, not in use number. My online profile is correct, but for some reason it uses this old number? How am I supposed to activate the showmax deal if I cannot receive an otp? Pathetic and seems like Vidacom does not want to give me this deal. Then Vodacom has the nerve to tell me “contact showmax”. How are they going to change where the otp is sent???