Complaint about vodacom insurance

I have been a loyal customer for 14 years and back in May cancelled insurance on my sons phone as he was going overseas and the insurance wouldn't be valid. I was told this would be cancelled in June, well this didnt happen. July I phoned vodacom and they say my cancellation was entered incorrectly on the system but would make sure it was cancelled in August and I would be refunded. August came and I'm still being charged for insuranced ,so I phone again and was told the last agent forgot to cancel it... and it would be done in Sepetember. My september statement showed a deduction of R133.04 and not the R665.22 that I am owed... I again contacted vodacom and was told it was in their hands and has to be approved before it can be refunded.? What must be approved .... its MY money, if this would have been the other way round i would of been hung, drawn and quarter, I'm now considering taking out a theft case against them as this might be the only way of getting MY money back???