Failure to update my credit record details

It’s been a nightmare to try and cancel a contract with MTN. It took me 3 months to finally get my contract cancelled after numerous call and emails with poor feedback. 4 months later they refuse to update my details on Experien, this contract appears as active and my details were last updated in October 2024. I have tried to reach out so many times and was directed to their legal team, even now my details are not updated. I’m so tired