MTN - TERRIBLE SERVICE ON NEW SYSTEM

MTN has been disgusting to deal with in the last six months! They have migrated to a new service which no one can apparently access? I requested an upgrade early as my previous phone broke. I am an educator, and need my phone to record videos and send work via Whatsapp. I have been struggling to get an upgrade from them! To give them money!!!! I went in store and ****, they can apparently give me an upgrade, but the phones they had were older than my current phone and more money? I don't understand!!!!! I am currently on a call now with the cancellation department and they have said that i must pay over R5000 to cancel this contract. I am so upset with MTN. You have really let me down.