Why am I on a topup contract?

Hi I was sent an sms from Edgars for reduced airtime to which I rep**** yes. This changed the status of my prepaid number to top up contract. None of this was explained to me.<br> I now need authorization from the airtime company for a sim swop, I do not know who to speak to so I emailed Edgars customer care and Nomzekelo Mnini said I will receive feedback but nothing since 17/06/2015. I tried the company RMCS and they asked me to contact a JHB number *** but nobody answers. <br> Please could someone help, I need the contract cancelled and I want permission to get a new sim.<br> Permission from a company that I don't know.<br> <br> Regards<br> Mandy