### Answer Pay-As-You-Go users are allocated a quota of 20 concurrent calls as part of the service. [(1) ]() The sources mention that additional concurrency can be purchased for $8 each, and that pricing is for increasing the limit (not for active calls) . [(2) ]() , [(3) ]() However, the available documentation doesn't explicitly confirm whether you receive a credit or refund for lowering concurrency below the default 20. The -$144 you're seeing in the dashboard likely reflects the pricing calculation (18 concurrent call slots × $8 = $144) , but whether this results in an actual credit depends on your billing arrangement. I'd recommend reaching out to Retell support directly to confirm: - Whether lowering below the default 20 concurrent calls generates a credit - How the billing adjustment would be applied to your account Check out these potentially useful sources: - [Understand concurrency & limits]() - [Documentation]() Would you like a general answer based on my knowledge instead?

​ To learn more, see the sources I considered: [[1] Understand concurrency & limits](https://docs.retellai.com/deploy/concurrency) [[2] Questions about Concurrency (Active Calls)](https://discord.com/channels/1186424376300679209/1458432900377874529) [[3] Discord message from @maximomejia1907 on 2025-02-21](https://discord.com/channels/1186424376300679209/1186462578310910112/1342457448614858843) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.