Credit Score Tarnished

I recently discovered that someone had *****ulently app**** for a contract last year or 2021 and went to Vodacom to enquire the representative informed me that as per the system there was an attempt which was unsuccessful, however as per the Credit Report there is a balance of close to R20 000 reflecting, now you can imagine how that is affecting my credit score negatively, I did my due diligence after there was an unauthorized D/O on my account which I disputed, then went into Vodacom only for them to say that there is nothing reflecting, how do I repair my credit score. This has impacted me significantly and I need this matter resolved ASAP because the longer it stays unresolved it impacts me and my future job and credit applications negatively, can I be supp**** with the call recording or the footage of the person who opened the account so that I can open up a case of identity theft. Please can this be looked into ASAP!