Unexpected ₹147K Claude charges despite active Microsoft for Startups sponsorship

Hi Microsoft for Startups team and community,

I am a Microsoft for Startups participant using an Azure Sponsorship subscription.

I recently discovered unexpected charges from Anthropic Claude through Microsoft Foundry. The Claude usage was billed as Marketplace/SaaS charges instead of being deducted from my Microsoft for Startups Azure sponsorship credits.

My Azure Sponsorship credit is still active and has a substantial unused balance. However, my Azure Cost Analysis currently shows approximately ₹491K in September charges, with approximately ₹475K categorized as SaaS, primarily related to Claude.

I currently have an invoice amount of approximately ₹147K due.

I stopped the Claude deployments as soon as I discovered the charges to prevent further usage.

I contacted Azure Billing Support multiple times, but the requests were closed with a message saying that the issue falls outside Billing and Subscription Support because it involves Marketplace/third-party services. I was directed to Marketplace refund resources instead.

I also tried to contact Microsoft for Startups support. I was previously instructed by the Microsoft for Startups team to use the Founders Hub support portal, but my account now redirects to the newer Microsoft for Startups experience in Azure, where I cannot find the documented startup program support option.

I need help getting this escalated to the appropriate Microsoft for Startups or Marketplace team for an actual review.

Specifically, I would like to know:

1. What is the correct support channel for this situation?
2. Can Microsoft review the unexpected Claude charges?
3. Is a discretionary credit, refund, or billing adjustment possible given the circumstances?

I can provide screenshots showing my active sponsorship, remaining Azure credits, Claude charges, and invoice privately if required.

Thank you.