Cannot close account after paying-off unknown account charge

Markham derated my credit score for a R 113 charge it had on record since 2014, which it could not explain why it was on the account. No emails or enquires was made in 4 years because contact details was logged incorrectly.

Only for me to enquire about the status of my account a month ago. Just paying the R 113 to close my account with no resistance

I now contacted Markham and told them to close my account and they stated it inactive, not closed.

I want it closed and all my data removed from Markham systems.