Bad service

I had an account with Game Store, I closed the account last year March 2018. But since then they never updated my profile on credit beareau. I contacted them last year about the matter since the account is showing as an overdue payment. They promised to update the beareau, but the account even today is still showing as an active account with an overdue payment. This is affecting me negatively as I always get declined for credit due to this account. Last year on May 22, I came here on hello peter to complain and RCS responded by saying they will resolve the issue but never did. Pls help me am not getting any help from RCS.