Hello and thank you for using our website.
These do look like Australian landlines. The only thing I can do is to try and dial one or more of these numbers myself. If I get the same message then there’s an issue with your numbers. If not there’s a problem with your phone line. If you want to do this just send me the number(s) using the Feedback link at the bottom.
And one other thing: are you 100% certain that these are mobile numbers?