Transferred Airtime Without My Consent

Vodacom...this is now the 3rd time that airtime gets transferred out of my account without my consent.This time the number is ***. Every time this happens all use do is just refund me. Don't use investigate this matter further. I honestly think this is a inside job as it happens all the time and the ******** knows exactly what my airtime balance is so that they can transfer it to themselves.When I call the number from my landline my call gets rejected by the person. Doesnt all sim cards get rica for security reasons? Surely use are suppose to pick this persons information up on your systems. I am not a happy customer at all!!! I called in to customer care...unfortunately they cannot help me as there systems last updated at 7:45am this morning..how convenient. I would like this to be sorted out soonest. The reason for my post is to make others aware as we don't know to who all this has been happening to.?#?bring? this ******** to justice?