Does a department have any obligation to respond to a student petition against a teacher?

If all students of a class sign a petition claiming that a professor of a course is disqualified to teach, does the department/faculty change that professor?

Do students have this right? and what is the procedure to do so?

When ALL students sign a letter that they do not learn in the class of a professor, what is the responsibility of the department/university?

Some mentioned the need for solid evidence. What evidence students can provide that they do not learn anything in a class?

Isn't it the university responsibility to satisfy students by offering high quality education?