During formal examinations you are expected to follow the written instructions on the paper and the oral instructions on the day by the senior invigilator. Failure to do so constitutes an exam irregularity.
The University requires students to conduct themselves in a reasonable and proper manner at all times, both on and off campus. The University can take action where a breach of its regulations relating to student conduct has occurred.
There may be a number of options you can consider if you are unhappy with your course or if need to take some time out. Want to change course, withdraw, leave of absence?
There is a process under which an official concern/complaint can be raised within the University.
You may experience problems with your supervisory team whilst at university. It is therefore important to know what your rights and responsibilities are as a part of your course.
(This is fairly different from problems with your tutor which is covered under making a complaint in general)