Unauthorized Billing and Cellphone Contract

My Vodacom prepaid cellphone suddenly stopped showing the caller I.D., so I queried this with Vodacom customer services. It has been found that that my number is suddenly on a 24 month contract with Edgar's/Jet cellular and because of this, the I.D. showing has somehow been blocked. As all this has been done without my knowledge, and no 24 month contract was authorized by me, I called their customer services number, given to me by Vodacom, on *** for assistance. The person who asked for my cellphone number, I.D. number and account number surprised me, as he could not find any details of me on their system for any contract or purchases. Similarly last month, R25.00 Cell C airtime was billed to my Edgar's account, and when queried, no details of me could be found by Edgar's/Jet cellular. The persons assisting promised that these would be rectified and cancelled but to date nothing has been done. Vodacom customer care confirms that the contract problem is still pending and needs to be sorted by Edgar's/Jet cellular. It should be noted that this is an act of theft and *****, and will not be tolerated by companies that we entrust with our personal details.