MTN refuses to settle my account

I trust that you can help me to sort out this problem.<br> <br> The end of October 2014 i decide to cancel my contract with MTN which<br> at that stage were months overdue for a upgrade. the beginning of<br> November 2014 i contacted MTN on which i told them that i am going<br> over to CELL C and that they arranged for my number to be migrated .<br> <br> I Phoned MTN to confirm on which they said i can still use the R 300<br> odd rand data still liable to me .Within that same week my sim card<br> were deactivated on which i accepted that my contract with MTN is<br> something of the past.<br> <br> Ever since i had various calls and correspondence with them and they<br> still say that my account is still active.I am retired therefor there<br> is no money to throw around for someone not doing his job.