Error 429 even though acct, key, rates, etc. are all fine

I have a paid acct, current limit $20. never used more than $0.50 per day, never faster than the rate limits. I seem to be blocked. There seems to be no way to contact customer service. Doesn’t work for api or for playground. What do I do?

I’m in tier 3 with credits above 0 and still get the same error. Just paid another $5 and nothing changed.