unwrongfull phone bill

Phone billing vodacom welkom free state<br> Since 2005 using top up contract with vodacom<br> Paying on time all my accounts until last year when the following happened.<br> Changed of contract from top up to business without my concern.<br> <br> Billed for 3 mobile phones which I have never received.<br> Billed R12000 for no reason, no paper trace of how I spend that R12000. <br> <br>