Contract updrade *****

I called vodacom end of June to give 1 month cancellation notice for my cellphone contract. The consultant confirmed that she has processed. 03/08/2020 I got a debit order notification on the same contract and called vodacom to query and was told 19/08/2020 an upgrade was done at some vodacom shop for Iphone 11 pro to which I disputed and queried and the consultant said vodacom will contact me in 24-48 hrs which never happened. I called to follow up and have been transferred from one department to another and still no help. I am tired of being thrown from pillar to post and the matter is not resolved. This is ***** and need it resolved!