telkom poor customer service

iv paid telkom outstanding of R390 via their colletion PnP attorneys and have been trying to get a paid up letter to clear my credit status.its been pillar to post in receiving my letter.And i am been delayed as i have app**** at a institution and my hinderance is the telkom account reflecting on my credit status.how do i solve this issue.Telkom has the worst customer service.i hate it