so it's the plug from the power supply that's snapped off.  is that correct?

what I would say is that if it's under 1 year old and you have the original proof of purchase when it was bought new (less than 12 months ago) then you are entitled to send it to a service center and have them check it over and if it's a manufacturing fault it will be fixed.  if it's found to be misuse then you would have to pay for the repair.  so, just ensure that you've never stood on the power cable, or anything like that which may have caused the issue.  if you have then it may be worth your while to just buy a new power supply which are only around £20 (as with the warranty it's up to you to take it to or ship it to the service center, which may cost you some cash anyway), and to get the plug out, get a pencil with a tiny dab of super glue on the tip stick it to the plug, and wait a min for it to dry, then pull it out.  be careful with the glue though.

here's how to find a service center: http://line6.com/service_centers/ and you can just contact them directly.

Hello,

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  Line6Miller