MTN ****! Cancellation mot done. Billed x6 monthly subscription.

I requested cancellation of my account on 25th August with 9 follow-up emails after that however my account is sitting at a R 2800 bill whereas my monthly subscription was R 469. Firstly, why has the retentions department not rep**** to my emails? Secondly why am I being ****med to pay R2400 more than what I contracted with MTN for? I wanted to get a Black Friday deal but after this there is no way I will. Additionally I will take legal action to claim all the time wasted in trying to have this sorted along with the mental torture I have had to withstand due to the online consultants not understanding this simple query! How do you hire these people?