MTN ***** Department Failure to Assist

I discovered (when attempting to secure a home loan) In May 2019 that there was an MTN account opened in my name (never had an MTN account, never enquired, never wanted one). I queried this with MTN ***** Department on 14/05/2019 and on 23/05/2019 Veronica Smith responded to me. On 25/05/2019 our emails indicate that V. Smith informed me that the account had been closed off as *****. However, today - 06/01/2020 - I have received indication that the MTN account is STILL reflecting in my name and is negatively affecting my credit record. I am extremely concerned by this and would be grateful if MTN could take immediate and conclusive action to close this account off from my name.