How frustrating for you - I'm glad you are sorted now though and can enjoy the holiday. It looks as if maybe they stretched the metal a wee bit too thin when fitting it.
It would appear to be a manufacturing defect but we have quite a few ex and present factory moles on here that will doubtless attempt to justify it on the basis that it is hand built.
It would have been a good PR opportunity for MMC to put this right for you IMHO.