Application rejection from 2015 till 2020

I have been applying at Unisa from 2015 and paying the application fee , and their response is always the same that I don't meet the requirements, but my matric score points allow me to study at unisa either for a diploma in law or higher certificate in any course , I don't even have the option to appeal their decision on line as they closed the appeal section. What really frustrates me is that they don't even answer their phones when I try to call them to understand what's the problem from 2015 till now , and I see in 2020 the applications are open all year yet we cannot get a space to study is it because we are black we don't deserve a chance to become something in life or is unisa specifically made for a certain class of people no poor people like us? I would really like to understand why they say their admission points is this much and yet you are told that you don't meet the minimum entry requirements and when you calculate your own points you find out that you are qualified to study