Mtn service shocking

MTN has got to have the worst customer service ,

I have emailed MTN customer contact portal and have not received a call regarding my upgrades,

I have been to an MTN store and to my great frustration they do not have the same deals as MTN retentions department has.

Why does MTN even bother having stores then.

Then to top it all off I call the MTN call centre ,select the upgrade option to which I then receive the notification that MTN does not have anyone to help at the moment .yes thats the shocking voice prompt MTN has.

The service level I am currently receiving from MTN as a SME client is atrocious.

What do I need to do to cancell my lines and port.