Welcome to the Community, I'm sorry for the problems you're experiencing with your telephone service at the moment.
I've located your account to run some tests on the line from our end for you, we're not detecting any errors from our end at the moment though. I hope that means that things are working as they should at the moment?
If not, have you been able to test your handset at all? By trying another handset or your handset on an alternate line?
We're looking forward to hearing from you and getting this issue resolved.
Thanks for the response, once we get the phone working you can dial your mobile number to get your telephone number.
As for the issue itself, we'd really love to test the handset. That error message your seeing will very likely pop up in any circumstance of the phone not working so it doesn't necessarily mean that there's an issue with the line.
If you're able to test the handset, either by trying an alternate handset or yours on an alternate line and that still doesn't solve the issue, we'll be able to arrange for an engineer to come and take a closer look with no risk of a charge for the issue being with your equipment.