No customer service at all.

I've requested since March 2020 that MTN change my primary number (one of five contracts I have with them) on my account, after THEY changed it somehow. 5 months later and numerous calls and emails, still nothing done. I'm sure it's a simple task, but somehow no-one seems to know how to do it. Also, my data-share won't allow me to add additional number(s). This used to work, but suddenly has every error you can think of when I try to do it. Yet again, numerous requests, calls and emails and nothing gets done.