How can a Microsoft for Startups user escalate unexpected Claude Marketplace billing?

Same situation here: Microsoft for Startups member in India, Claude in Foundry (claude-ccu-azure-hosted-plan) billed as Marketplace while my credits covered every other Foundry model. Azure Billing support (a named engineer) confirmed they can't credit Marketplace charges; Anthropic's support says they can't refund Azure-billed usage and to ask Microsoft; and the Support link on Anthropic's Azure Marketplace listing redirects back to Azure support. I've paid the invoice and deleted all Claude deployments.

A Microsoft moderator previously raised this with the product group, and one Startups member was offered a $1,000 special-exception credit by Microsoft support (Q&A question 5728641). Could a moderator or the Microsoft for Startups team confirm the correct escalation path for these one-time exception reviews?