What you've described is incredibly frustrating, waiting 26 days without a resolution or meaningful update is simply not acceptable.
I strongly recommend posting a concise, factual summary of your issue—including the lengthy delay and lack of response—on the Microsoft Community support forums. Microsoft support managers actively monitor these forums, and public posts like this frequently receive the attention needed to unstick a stalled case.
If this guidance helps you get the contact you need, please feel free to mark this as an accepted answer. I'll be hoping for a positive update from you soon.