Dear Novel London,
Thank you for posting to Microsoft Community. We are happy to assist you.
I'm sorry to hear that you've been having trouble with your refund. To lodge a formal complaint, you can contact Microsoft Support by going to Office 365 Admin Center-> Support-> New Service Request. The support engineers there have the correct escalation channel, and this is the most efficient way to report such issue. You can refer to this article to check the way how to raise a ticket: Ways to contact support for business products - Admin help. The engineers in related team have higher permission and resources than us to escalate your complaint and get the issue resolved.
Note: End user need to contact Office 365 global admin to perform some standard procedure.
Important Note: If any organization's Office 365 Business/Business/Education subscription is from a unionized partner or reseller, and if the global admin can't open the service request on their end, they may need to contact the reseller's support provider so they can help the global admin open the service request on their end. after the Office 365 support team is able to participate in the service request.
I would really appreciate your valuable time. Thank you for your kind cooperation.
Sincerely,
Sherry | Microsoft Community Moderator