False device fee charged by Telkom

I recently upgraded my WiFi at home. Upon upgrading the only thing that the consultant informed Nd about was the prorated increase in data costs, which I accepted. When I received my invoice I was charged R1 400 for a “device fee”. I already have a device and was very confused about this. I’ve logged a dispute over two weeks ago and have followed up twice —- with no resolution. Today my account was debited by this R1 400 despite it being a false cost!! I want my money back