Thanks for the response and sorry again for the problems you're receiving.
Are you able to dial your landline from a mobile number to see if that works? If that works fine, would you have any idea as to the phone numbers that aren't able to reach you and what attempts have been made?
As Nat has mentioned, we're not able to locate your account using the information you've provided so far so I've sent you another private message requesting some additional information to be able to run some tests on the line from our end, you can view that message by clicking the envelope on the top right of this page.
Apologies again for the inconvenience caused, we're looking forward to hearing from you.