Hi Veryannoyed2,
Welcome to our forums and thank you for posting. I'm truly sorry for any issues you've had with your landline, we'd be happy to help with this.
I can assure you that we would never look to change a customer's landline number without their express request/permission. Silly question, have you tried dialling the correct number to see if you're able to get through?
If you have trouble calling your own landline, could you let me know what happens when you test it? Is there an error message or certain sound that you hear?
Have you also checked the outgoing number by performing a test call from your landline to another phone? Is the correct number displayed?
Thanks,
Rachael