Hey there
Thanks for signing up with us
The "customer is ceased" error means that Openserve have not updated the number from the previous cancelled owner on their side, so the line cannot be transferred into the holding pool. It might just mean waiting a day or two for that admin to be resolved. If not, then we'll have to escalate to our Openserve account manager to have it cleared. We poll the holding pool every 24 hours once you sign up to check if the line has become available, and only close it after multiple failures. So if they sort it out, it should be fine, but let me check for you.
I'll reply on your PM