BigTransformerTrev that is just wrong what they did to your stuff. They're guests in your house and should act as such.
If your rage is a source of humour just stay calm, and send them the bill for complete replacement at current value.
I've had a couple of TFs broken but only when I was a kid. Some guy broke Laserbeak's leg off and my cousin lost the clear piece on Grimlock's back. Small change compared with what happened to you.