Threatening legal action unjustly

In September 2014, I was contacted by the call centre and offered a data contract. Five days later i decided against keeping the contract and contacted Vodacom to cancel and collect, which they eventually did.<br> <br> I have been receiving bills ever since although I contacted the call centre on numerous occasions to inform them that i do not have the sim card and the modem.<br> <br> Today i get a mail threatening legal action for something i dont have, unreal!!<br>