Exams I did not write

One star is too much for this collage, I was suppose to write exams June 2022, they didn't send me confirmation letter and the time table,so I did not write. The charged me R900 for those exams, I called in August 2022 to dispute the issue, they understood very well and then they send me forms to apply for Nov/ Dec 2022 exam, I wrote the exams. Now I paid for them, now I'm still owing Damelin R900 for June exams that I did not write, because of their negligence. There's no assistant there.