Billing me for 2 numbers still after repeated requests to cancel

Vodacom must be the most pathetic cell providers. Gone from hero to zero. I have been trying for ages to get 2 numbers cancelled which they still haven’t done and they continue to invoice me. When I phone (repeatedly for a while now) they say they can’t fibd the numbers or some of them say it is on their old system. Bottom line is they invoice me for numbers that I don’t even remember and will not cancel them