case against university

sir.... i am pursuing final year in open university.. Exam will began from next month . But in the admit card it is mentioned that two of my will be held at same time and date. These two are optional papers . For such i have sent many mails to examination department but no one answering . Regional center says what will we do it is the duty of the centre.. When i did inquiry for the same if such things happen one need to wait 6 month for giving another paper (one paper this sessions and another paper next session). If it is so than i can't apply for govt jobs and my one year will waste. And this is not my fault .Can i file case against the university and how to solve the matter in appropriate time so that i can give my exams ? These are not my back papers. pls reply . Thank you