Unable to cancel my month to month contract!

Hi<br> <br> I have had a contract with Red Bull Mobile that has been running month to month. I have called the call center to cancel my contract on the 8th of May and have it converted to prepaid. They requested me to also email [Email Removed] which i have also done on the 8th of May. Having not received any communication from them, i decided to call the call center again. Now i get told that i cannot cancel my contract and change to prepaid due to the migration from RBM and Cell C currently going on. And this can only be done on 1 June 2015 and effectively can only be cancelled by 30 June 2015!<br> <br> Please can you resolve this and have my contract converted to prepaid! I cannot afford to be billed for another month..