keep billing me for services cancelled

Web Africa keeps billing me for services that I have cancelled. then in a few months the services are back on my account. I have tried 5 times now to cancel my ADSL line and service as i have switched to fiber with them and they keep on billing me for ADSL. When you phone billing the attitude from Besai Peters is that they will not unsuspected because it is short paid. she has a bad attitude and talks over you.