Why don't primary school teachers use substitute teachers enough? No matter how high or low the education level, anyone can substitute for the class.

This should be that the local school's own employment regulations violated the relevant regulations. At present, private proxy teachers have been cleaned up all over the country. It is required that school teachers must hold the teacher qualification certificate issued by the competent education department, otherwise they may not take up their posts. You can report to the local education authorities at or above the county level.