Call centre and not following instructions and impossible to talk to a human being

Typical issues with MTN - Firstly I request my number to be changed to Pay-as-you-go and they incorrectly change it so some other deal (you should listen to the recorded call - it's all very clear). Now I'm trying to correct that by calling MTN and just end up on hold endlessly. First time I waited for 10 minutes and then was simply cut off. Now I'm up to 10 minutes again listening to annoying advertising. As a telecommunications company, your telecommunication is exceptionally poor.