Outstanding bills from 2015

So I popped into Telkom store the other day to see what specials they had. While the gentleman was checking, I asked to check up on my current contract I had taken out for my daughter about a year ago and to check up on my internet account to make sure all is up to date. The gentleman then says to me that I have an out standing amount of R13000 from 2015. Now this matter was resolved along time ago. Before I begin , I would just like to point out that this matter was resolved a while back and if they go back on their records it should show, and before I took out another contract ,they confirmed that I owe nothing and that everything is cleared up. Now also simple math here, Even if I did owe Telkom this huge outstanding amount, how was I able to take out another contract for a phone and another for a ADSL line. I work out of the country and each time I would come home , I had extra amounts on my contract and I did not even use data overseas. when I would come back home ,no one at any of the stores could help. It was always passing the buck to the next person who also had no idea what to do. I then took to hello Peter with this complaint and Nicholas, Wynand de kock got hold of me. emails were going back and forth ,I was even handed over for the out standing amounts . These two gentleman sorted everything out with screen shots showing the reversal of the funds and a letter saying that all is clear. this was my case no;***7. I still have all the emails going back and forth and screen shots swell as the clearance letter of when they handed me over. Again before I app**** for a new contract for my Daughter ,I check to make sure I had nothing owing, and all was clear. I have called the call centre and there is nothing they can do about it. Is there anyone that is able to resolve this matter once and for all or do I go further with this.