Debiting money *******ly

My contract expired and I cancelled the insurance on the 2 handsets. That was in July. I am still being billed for the insurance on the 2 handsets. It is still on my November invoice! I have phoned customer care and a ticket was opened and closed and nothing... I have phoned insurance cancellations again only to be told it was cancelled in July.. so Vodacom just keeps taking my money for something that does not exist?? Isnt that called theft? All calls are recorded so I am sure if somebody wanted to all can be verified.