Exam Rewrite Denial Disapointment

I was studying for a Personal Assistant Diploma, and completed my final two exams in July. I recently received my results and had failed one of my exams. I requested the opportunity to write that single exam, and my request was denied. I was informed that I could enroll again and \receive a 10% discount"(which they offer to enrolments via their site anyway) and then ask to be exempt from subjects already passed.<br> <br> It is one exam that I need to rewrite in order to obtain my diploma. Essentially"