Apple Music

Get an Apple Music Student subscription - Apple Support - https://support.apple.com/HT205928#joinStudent

If your institution isn't on the list and you think it should be: https://www.myunidays.com/US/en-US/support/verifying/contact

Contact Apple for support and service - https://support.apple.com/HT201232

or more directly: iTunes [Store] Support - Use this form for assistance with account and billing, code redemption, or purchase questions --> https://www.apple.com/emea/support/itunes/contact.html

You tried to contact them? What did they say?

You could try contacting Apple but I suspect they just rely upon the list they get from Unidays so if you aren't are it there is nothing they can do.