This is the screen it always gets stuck on. None of the buttons work, except the back button.
I don't want to sound patronising, but just to be clear are you ticking the 'remove' box, before clicking on the remove button? If you don't tick the boxes, you won't be able to remove anything because it doesn't know what you want to remove.
Bigpipe use port based authentication. Any non blank username/password will work.
At the moment there are a couple of potential issues with OP's line as far as I can see. Either the modem isn't configured correctly, there's no sync, there is sync but it's not from a DSLAM port connected back to Bigpipe, or Bigpipe need to update the port information from their end.
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