Poor Service Delivery From University

In 2014 I did a year course through Unisa. I attended all the exams and paid all the fees. After completing my final exam, time passed and I heard nothing from Unisa for a very long time. I went online and had a look at the details of the course. I noticed for the first time that it said the course was incomplete, so I wrote an e-mail and asked why it states that the course is incomplete, as I attended all the exams and paid all the fees. I got a response that said that there need to be an audit and that I will receive my certificate after the status has been changed to "complete". Time passed and by the end of 2015 I send another email just to make sure that there is nothing I could do from my side. I got exactly the same response. About two months ago I went to Unisa in Parow and asked a lady the same question, on which she rep**** that there is still an outstanding online assignment that needs to be done and that I need to register to complete it. I tried to register, but Unisa won't grant me admission as I can't register for only one subject. Now I would like to know how do I fix this problem, as I paid for a course that means nothing at this time. I emailed a Unisa professor on the 31st last month, asking him if he could point me in the right direction regarding this problem, no reply up to now.