New system disaster

I have been having a issue for the last month with mtn as i cannot upgrade due to a system that is not working first i could upgrade on 26 march and the next day the app says 26 april due to the new system that is not working.

I phoned and spoke to a lady named ALICE MAHOLEHOA and she did the upgrade and send the documents away a few minutes after the phone call it says i have not sent the documents as i was on the phone with her probably 35 minutes to make sure she got them.

I keep calling and no one can help me to tell me how far the upgrade is or get in contact with as 4 of the agents i spoke to emailed her but no reply as u also send her a email.

Customer service means nothing.

And now i cant cancel the upgrade and my contract due to i have to wait for her to get back to me.