STILL BEING BILLED AFTER CANCELLED CONTRACT

I have recently (Feb 2015) cancelled my Autopage contract due to pathetic service, I waited for the 24 months to finish and did all necessary steps that were requested by Autopage, I had to do this about 3 times as the first 2 times in December and January were never processed. After I eventually got everything sorted I was told I will have one more invoice in the beginning of March that will be for the month of February, now in the beginning of this month I was billed again for the full monthly amount of R324.50, but I don't have an account with Autopage anymore, my number was moved to Vodacom direct. I phoned immediately when I got the notification and spoke to Shevon in Canal Walk, she said she would sort it out, since then I got messages from Autopage saying they will credit me with R62.80 into my Autopage account? After I told Autopage to put it back into my Bank account as I don't have a Autopage account, I have left 5 messages for Shavon with not one call back. WHAT THE HELL IS GOING ON?????