@Leo
I'm really sorry to hear about the trouble you're experiencing with the "Over concurrency limit" issue. It sounds like there might be a problem with lingering sessions or a misconfiguration in the system that's preventing new calls from being initiated.
Since this issue has been ongoing for quite some time, I would recommend reaching out to the support team of your phone call provider to investigate this further. They should be able to look into the backend systems to identify any stuck calls or sessions and clear them out for you.
In the meantime, if there's anything else I can assist you with or if you have any other questions, please let me know. I'm here to help!