Unhappy Customer with Mtn

Someone from the mtn sales department phoned me as i requested for an additional contract they advised me that it will be an upgrade. After the call mtn wanted to deduct R3890 from my bank account for an early upgrade on my contract which no big amounts like that was mentioned or that it was for an early upgrade phoned them back on *** after 20 minutes then they said it would take 7 days for cancelation and then only i can do a request for a new contract. Wanted to speak to a manager and consultant put me on hold for10 minutes and was not helpful at all