Worse service from MTN - They make a mistake and I am trying for over 3 weeks to get this sorted out with no luck

I am fed up with the service at MTN... Sorry, I cannot complain about the service as there is NO service. Where can I find a number where I do not have to go through a computer generated call with options? A call centre agent DE-REGISTERED my cell no when I asked to go from account to pay as you go (31.12.2021). Why????? I have NO idea. Now I can not use my phone and NO-ONE at MTN (if I get to speak to anyone) actually gives a hoot about what my query is and the fact that I cannot use my phone. This is after I have been a loyal customer for over 15 years. I will NEVER EVER use MTN again... This is after I get to speak to someone in order to cancel my account and get my numbers ported. WORSE CELLPHONE PROVIDER EVER