Cell C, The most Horrible Experience EVER

I am trying for so long to get through to Cell C's legal department, I get transferred from pillar to post however nobody is assisting me.

My account has been paid up in full and i cancelled the contract because of the poor service i received all this accrued in September 2018, i am still battling with Cell C to update my credit profile. On Trans-union it shows that this account is still active with a installment of R498 however i dont owe Cell C a cent.

This is very aggravating because it is negatively affecting my credit score and affordability, please can someone from Cell C get back to me and please update my account with Trans-union or send me a paid up letter so i can submit it myself.