"message":"Over Concurrency Limit." & error: "Rate limit exceeded"

I’m currently sending about 15 calls per minute from GoHighLevel into Vapi, but I’m consistently seeing 10–50% of them fail with the following errors:
"message": "Over Concurrency Limit" and "error": "Rate limit exceeded".

I’ve already purchased 3 concurrency add-ons in addition to the 10 concurrent calls included with Vapi, so my understanding is that the account should be able to handle up to 40 concurrent calls.

i have a q and distributing 15 calls per min. and the average call is less than 20 sec.
how come i am still hitting the concurrency limit?

Could you please confirm if there’s an additional limit in place?
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