MTN billing me for somebody else #2

On 3 Jan I have reported that I'm getting billed for a number that now belongs to somebody else. On 7 Jan Mazwi Zuma rep**** that they are looking into possible ***** and that the amount due would be reversed on the invoice. Mazwi promised that they will revert to me. I waited for MTN to revert to me but nothing. What did happen is that MTN collections now sent me a notice for payment of outstanding debt with promises to report me at a registered credit bureau. The payment due was never reversed by you as promised. Just to recap, the number MTN sent the sms's to doesn't belong to me anymore! The account you are billing are supposed to be closed. I cannot phone MTN either as 083135 tells me that the number is a pay as you go number. I also sent ********** an email (query ********** 7) and they promised to get back to me within 8 hours. Four days later and nothing! Can you please attend to this matter urgently! Regards, Andre