Terrible service

If i could I would give no stàrs.Cancelled service in 2020 because of bad service in initial month but am being still hounded for money. Initially the excuse that they did not get the router so they came and fetched it.After that was quiet then after some months started deducting money in obscene amounts. Sometimes R1000 at other times R300.Again I informed that we owed nothing. Again all was fine then started deducting again. Eventually got fed up because no one was listening .Now I received an email from a debt collectors for a service that i did not have the pleasure to enjoy. Terrible customer experience and service. Highway *******.Now want proof to investigate. Four years later