Terrible terrible service - your right hand does not know what the left hand is doing!

I used to have a contract with MTN. In December 2015 my debit order amount was increased by MTN for a service I did not order. On January 22 2016 I spoke to Portia at the call centre and received ref numbers 142 073 110 and 142 400 041. MTN admitted the error and agreed to stop charing me. On 27 January 2016 I cancelled my contract altogether and received an a confirmation e mail from Deon Opperman with ref number ********** 0. I also cancelled the debit order with my bank. Since then MTN is claiming that I owe them money and the amount increases regularly as the interest is added. During 2016 I wrote various e mails to MTN and sent an affidavit - I have copies of all of this - to try and resolve the matter. I continue to receive sms s from MTN legal partners for money I do not owe. In fact MTN owes me money as they continued to charge me firstly for a service I never ordered and secondly continued to charge me after I had cancelled my contract. In October last year I spoke to Ignatius at and he requested I send an e mail to him at ********** I subsequently spoke to him he said the matter would is receiving attention. BUT I still regularly receive claims for money from MTN. I despair. I've tried and tried to resolve this matter. Laurentia Richer **********