grades - Should a marker TA handle students' marking issues by email?

I am a university marker TA. The instructor requires TAs to meet students if they have marking issues. But I found most students just come to meet me for better grades, not to ask questions, and some are tough to handle; they just insist they should get better grades.

I feel that is annoying. Is it a better idea to handle the cases by email, and let them talk to the instructor if they have further questions?