Unsafactory service from Mancosa as an Institution

I received my Final results December: Operations Management - 62 % SCM 3C - 60 %

I was told told I failed both, I must re-register. I raised a query 17th December to find out was was the pass mark required and up to today I have not received a response or a resolution on my query or tickets logged. I have phoned more that 10 times no answer. As far as I know 50% is the pass mark, I honestly fail to understand how 60 and 62% is a fail. This issue is preventing my registration for a Post Grad.