***** on my account

In February 2015 someone opened two new contracts on my account. I phoned Vodacom a million times to inform them that this Is *****. After a while when I phoned again, the person on the other side said that the case is investigated. They would've called me end of April to give me feedback on this matter. Once again I haven't heard anything from them. They also said that they blocked that two numbers, which isn't true. Today I received a bill of almost R10 000. I still pay for this ****** from February.