Bad service from Vodacom

We signed a contact 2years back. A data contract to be specific. I fell behind on payments when I lost my job then paid them back when I got another job. I settled the whole amount now they are refusing to update my profile and it is affecting my credit score. I requested a paid up letter but they are saying I'm in arrears. It has been over a month now doing a follow up to fix their figures but all the consultants are saying different thing. ('In arrears, *****, call logged and those lines.")