Still being billed for a CANCELLED CONTRACT ???!!!

I cursed the day the devil made me sign up with Autopage. <br> Cell number : *** - contract was taken in Feb 2013. Feb 2015 is when Autopage was contacted & advised to STOP their services, the contract will not be renewed &to have the number migrated to a prepaid line. In March 2015 I was billed R452.00 I was informed this is when the last payment was due. April 2015 is when the sim card became inactive. When the number was dialed it was listed as non existent. Went to AP greenstone to tell them I need the number active, as a prepaid line. Harold from there advised a sim swop was to be done - left after being told the sim should be active within 2-24hrs. waited 1 week &the sim still wasn't active. after pointless unresolved \escalations"&wasted time I was told Autopage can't assist with prepaid SIM cards. MTN"