If there is a conflict in the course selection in the university, you should make adjustments in advance, because the teachers in class will not adjust the teacher's class time because of the course conflict of individual students. On the contrary, only students will adjust their courses or choose new courses.
First of all, you should explain to your counselor that, according to the guidance of the counselor, you should find a college teaching secretary or a department teacher (it is also possible to go directly to the academic affairs office or other offices). If the teaching secretary can't change it, try to communicate with the subject teacher and ask the teacher to adjust the class with the person in charge of arranging the schedule.
When the teaching secretary and the teacher are unable or unwilling to change the course, if they are led to another office, then continue to find the staff in that office to explain the situation.