REFUSE TO FIX ERROR/STAND BY ********* BEHAVIOUR

Pathetic. After a lot of queries and emails - which they choose to ignore, they just want phone. I want all in writing. They are aware of the doctors Dr Grobler Centurion charging 18 % interest which by Law says 2%.The Dental Board acknowledge error and I am still awaiting fixing of all and I was even threated by a Seciton 129 after the account has been in dispute since February. How is that for compliance!!!