Unable to renew Apple Music student subscription due to verification issue

My Apple Music student subscription has expired, and I am unable to renew it. I have emailed the verification service (SheerID) multiple times but haven't received a response. I keep getting a notification saying, "You may have previously used a different Apple account to verify your student status." I am a university student and have been using Apple Music with a student subscription for years; I don't understand why this issue has suddenly arisen. I would appreciate your help. Have a good day.