Contract Issues

I received an sms to migrate from my LTE contract to a fixed line DSL uncapped. Iformed my LTE will be cancelled an I will onky be billed for the DSL. After installtion I am still being billed for both devices. When I called to enquired I was i formed to do the cancelation myself. Meaning cancelation fees. On taking up the DSL offer, I was informed they would cancel and I would not pay cancelation fees. Suddenly they are two different departments and I am being refered to different departments every time, but not getting help anywhere I call.