Poor management and bad communication

Zero stars. I upgraded my phone on the 9th April 2024 help by sthe nkosi from mtn and few days or a week I called to cancel the upgrade and they agreed to cancel since the phone was not delivered. Few weeks later I received an sms that my phone is out for delivery and I called MTN and they told me to call the DSV courier company and cancel and I was assisted by Keamogetswe and she gave a reference to show i cancele.the phone was then delivered and the same day I took it to the mtn in menlyn and they gave a IRMS number. I've been calling and and sending out emails because they are deducting money from my account and it's been 10 months now. 2 August 2024 they sent a message saying they are canceling the upgrade. The first payment was R514 on the 18 June 2024 and the monthly charges are R379 from my account every month until now. I need this matter resolved ASAP if not I'll have to cancel my wifi contract and sim cards as well.