Startup credits expired silently — GPT-5.5 charges — is there any path to resolution?

I've been in the Microsoft for Startups program since August 2025. My €5,000 credits expired on April 12 with no notification. I checked my entire mailbox and there is nothing from Microsoft about it.

On April 27, I deployed GPT-5.5 on Foundry — two days after Microsoft released it — still believing I was covered. I found out on April 29 by checking my own consumption data and shut everything down immediately.

I launched my AI startup in production two weeks ago. The invoice for April hasn't arrived yet but I estimate it at €4,000–5,000. This could end my company.

I've been through two levels of billing support and both say they cannot adjust charges. I've now escalated to the support manager.

My question: has anyone been through this and found a path to resolution? And does anyone have a contact at Microsoft for Startups with actual decision-making authority?

I'm not looking to debate the policy. I'm looking for a human at Microsoft who understands what "startup" means.