Hi mediasteve,
Thank you for posting on the Community Forums, we appreciate you coming here for help with your landline issue.
From what you have described, it sounds like you may have crossed phone lines with another local user. This is usually caused by cables being in the wrong place at the local cabinet.
I can see that you called us earlier today and spoke with our faults team. Were they able to arrange an engineer visit for you or provide a solution?
Let us know.
Beth