I’m currently facing an issue with the OpenAI API tiers.
I’ve spent $15.00, and yet I’m still on the Free Tier – despite it stating that I must have spent $5.00 to be upgraded to Tier 1. This has not occurred. It has been hours now.
I have been waiting for three days. 
I have been waiting for a week.
I have been waiting for days too.
Same issue here. I have several users of my bring-your-own-key software who have added $50 to their OpenAI account and are still stuck on the Free Tier. It makes no sense.
Just top up your credit balance it will upgrade to next tier immediately!!!