I have often stood in distribution warehouses that have tallied up the money they made on shipping at the end of the day. On occasion the shipping profit can actually exceed the profit from the product, as in your case. I was in one a couple of months ago where they were bragging how much they can get 'foreigners' to pay for shipping, and joking about it while holding thier sides.
Just thought I would let you know.
I suggest you send them a strongly worded e-mail, then await around for ages for a response, before using said Dye parts to fix a gun that is a *******ised dye gun anyway and already has more versions than Blue Monday by New Order.