Appalling customer service

This is the worst college ever , My daughter is studying through intec and we made full payment for the course as required . She made arrangements with the college to write the exams the next year and it was permitted . Now they are saying she needs to pay for an exam that she did not write exams for . She has been taken from pillar to post regarding this issue for months . She is told an agent will call her back but nothing is happening .