Vodacom ****

I had a contract with vodacom and I was owing R1036, I paid it infull, two weeks after paying I got a call that I was handed over to a company called Burnard and Raaf associates. Which claimed that I owed R650 ,I was toldI I can pay at a vodacom shop. I went and paid on vodacom system it showed that I owed R21 and I paid that. The company kept on calling and I asked for statements for the R650, instead they sent me a statement for R11000, after disputing owing R11000, I was asked to writing an affidavit that disputes the debt. I did, for 2 or 3 months on clear score it showed that account was paid up after the affidavit. Now I am handed over to a different company and I now owe R8000 plus and my account is back on as owing on clear score.