RCS Incorrect ***** allocation leaves potential customer's credit name tarnished

I app**** for a PNP store card on 15/10/2019 by contacting smart shopper number. I was advised that I was declined due to default payments. I denied this and was then put through to customer service upon which I was assisted by Melissa Pretorius. I enquired as to why it would reflect default payments as I have always maintained a good credit record and have not defaulted on payments as stipulated. She then advised that she would refer to the division that deals with these queries & upon her telephonic return advised me that there was a ***** block on my RCS account since 2017. In 2014 I app**** for a Builders warehouse card and received credit to the value of R4500, in 2015 I decided to close the account as it was no longer required. Upon trying to close the account, I was R50 over in credit and they did not close the account. So I kept the card, and never used it again. Every month until 2017 I would get my statement showing that I owed R0 and that my R50 credit was still there. In December 2017 I received a statement from builders (my usual monthly statement) and it reflected a purchase of R4000 on 25/11/2019 @ Shoprite Bellville. So I asked myself how come I have a builders warehouse card, yet someone made a purchase at Shoprite using my card number. Which led me to believe that somehow RCS gave someone a card with my number on it as you cannot use a Builders Warehouse card at Shoprite, but you can use a RCS card at Shoprite. I immediately called Builders who referred me to RCS. RCS stated that I should have a sworn affidavit, with a copy of the builders card, ID and three signatures. I did as they requested and even took all my statements with to show them. I took it to Goodwood to the RCS building. Within 2 weeks I received a letter from RCS (Vuyelwa Mzinyo - Dispute Analyst) stating the following (we refer to your enquiry regarding the disputed purchase on the MASSbuild account and we wish to confirm that you are NOT liable for the purchase. Our investigation has been concluded on 03/01/2018. The Credit Burea has been advised to update their records accordingly. Please use... and ID when collecting your new card at a Massbuild outlet (till today I did not collect a new card). Please accept our sincerest apologies for any inconvenience caused) . This mess has caused me to not get a contract with Telkom for WIFI as I was declined due to default payments and I told them it was impossible. I emailed through all my documents to Melissa, I emailed her the following day, I still have not received any reply from her or RCS for that matter. I am so appalled at this mess that was made not from my side but from RCS yet I have to bear the brunt of this matter. I could not understand that last year I received credit from Truworths to the value of R9000 (no questions asked) I received an overdraft from FNB - no issues whatsoever, yet here I apply for a PNP store card and I am declined based on a mess up of RCS.. My credit record that they said would be fixed, is not fixed because if it was then there would be no block on my account of ***** and I would most probably qualified for a store card.