Unresolved ********** account with RCS - matter was never closed by RCS

Good day, saying I am upset is an understatement. I received an sms about 11 years ago indicating that I need to settle my account with RCS urgently to avoid further legal actions been taken against me. I had not opened any account with RCS but it seems like somebody opened an account without my knowledge. I then did an affidavit those many years back and RCS couldn't give me documents to prove that I opened an account with them. As soon as they received the affidavit they confirmed that the matter is settled and that it was **********. To my surprise on the 21 July 2018 I app**** for credit with Game but was told I owed RCS as a result my application for credit has been declined. The most upsetting to me is that I am unable to purchase a TV at Game or Makro because they work with RCS. Nobody from RCS ever contacted me to tell me that I owe them and because of that, I was under the impression that the RCS matter was resolved. This matter is now blocking me for credit which is unfair to me as a consumer. RCS is telling me that they have to do their process of investigating and it is not a one day affair. What do I do in the meantime? Game and Makro have TV specials but I cannot buy on special because I am blocked. I want to say that I am very upset and I am now suffering the consequences of someone not doing their job as they should have.