From the FAQs, if this helps.

"Customers that purchased within the past 90 days may request a partial refund for the price difference between their purchase price and Indie. If you choose to make this downgrade, you will lose access to many great Xamarin Business features you already enjoy, including Visual Studio and email-based support."

That pricing is much cheaper than a full $999 price tag and is entitled to $249 upgrades for future, so it seems to be a bargain.

I just bought a license a few months ago. I'd rather keep the business license and the old renewal cost as well over a refund. It would be silly not to with the additional features if one wishes to keep using C# for long term cross-platform development.