Do not add more money until an ongoing problem with tiers and recalculation not working at all is fixed. Tier 1 should have been instantly delivered with any payment.
Then, not more than another five dollars to trigger a recalculation and see that the tier 2 works, which should be instant after that waiting period elapses.
Usage is not required. I’m sure if you added lots of money for credits that expire after a year, and don’t use them for services, OpenAI would be quite happy.
If it has been more than a week with you sitting on $50, you could just send a message through “help” - "action needed: fix my tier to match the amount paid and waiting period."