Mxm nonsense MTN Service provider and their useless customer service

One of their team member from retention department did an early upgrade for me and a day later I cancelled after realising that I have to pay a fee that was not brought to my attention. The contract was canceled but MTN billed me R2036.00 for that. I have been following it up to be canceled joo ayi I am tired. I am now waiting for my account to be taken to their legal or collection department maybe those one will listen since. I hate MTN so bad cant wait to finish up my contract. Plz don't waste you time is not worth the fight.