Mtn bad process and their lies

I wrote to MTN on 18 December 2017 to advise that my MTN contract ended in November 2017. It was confirmed that the contract was ended and I can see I'm not being billed anymore. However. I checked my credit report and I can still see that the MTN contract is active on my credit report and my details have not been updated at the credit bureau. Why hasn't this information been updated by the legal team even after I was told it would be? When will this be done?

I'm going to log a dispute regarding this on m credit record as I am sick and tired of MTN's lies and bad service.