Order US product from Amazon UK - LONG shipping times ?

I've ordered a product on Amazon UK that is being shipped by Amazon US. This was three weeks ago. It gave me a long delivery time because I didn't want to spend the item value just in shipping, so I went with standard.

What I don't understand though is that even after three weeks, the item hasn't even been shipped.

I understand slow deliver but does that really mean 'we won't even touch it for weeks' as well ?

Amazon chat is no help - they essentially tell me to either wait or cancel.