Man that's bad, def send it back, it's a typical problem with moulding these types of parts, the very nature of the layout makes it want to twist when curing. If it's any comfort I've actually seen worse, saw an EVO 8 bonnet just recently from the USA and it was shocking worst bit was the guy bought it coz it was cheap and it was going to cost him similar to send it back so he decided to cut his loses and scrap it

Like most things in life you get what you pay for I guess.

Hope you get it resolved very soon.

Cheers,

Jeff