Double billing

After calling several times without success. I am being doubled billed for monthly data and fibre. Fibre was installed in our area and I was contacted by telkom to upgrade over to fibre and they will cancel my data LTE contract. 2 months later I am still paying both the fibre and LTE. If I cancel my debit order I will be put on ITC and charged an additional R250 panelties. Why are you holding us ransom