I have already paid well over $2000 for the API, and I made my successful payment more than a month ago. According to your documentation, I should be eligible for an upgrade to Tier 3. However, on my API key page (https://aistudio.google.com/app/u/2/apikey), I still do not see any option to increase my tier. This directly contradicts the User Tier section in the rate limits documentation.
I have submitted four forms “Modified by moderator” and contacted Google Billing customer support, but I have not received any response at all. Is the tier upgrade actually working, or is the upgrade option unavailable to users entirely?