Primary Number

I've had my cell number since cell phones were being used. Tonight I wanted to connect to Showmax and entered my cell nr to be billed to my Vodacom account. I typed my cell nr in but the OTP was time after time sent to my son's cell number because apparently his number is still the primary number on MY account. When I got Mweb installed at my house 5yrs ago I ordered them to correct it but it was still not done. I am paying the bill, MY number is the main one on the accounts so why is my number still not the primary number? So I spent my whole evening on the phone to customer care at Vodacom with nothing to watch, since my son is somewhere on a cruise ship on his his way Mauritius. Thank you Vodacom for spoiling the rest of my holiday until my son comes back on the 5th....and for me not being in control of my OWN account. But if I don't pay promptly my service will be discontinued...not acceptable.