Vodacom gave my number to someone else.....

if there was an option to chose 0 I would have. am so ANGRY On the 7th May, I received a call from Rewards Co, selling a contract on behalf of Vodacom. The consultant explained everything to me, but I told the consultant that I need to think it. Contract was for R230. To my surprise, I get an sms saying that the contract is now active, and loaded with R175 airtime. I call them to find out what's going on, but they informed me that the contract belongs to a male name Mr Ndlovu. This is my cell number, has been my number for about 7 years. So in essence, my number has been given to this Mr Ndlovu, I am unable to cancel this contract, but they need to speak to the account holder. I have tried calling rewards as well as going in to the Vodacom shop, and I am not getting any joy. I need this sorted out ASAP. I need my number to be removed from this contract