With all due respect, read the terms and conditions...point 5 to be precise, and stop going on about false advertisement.
You got the turbo you ordered. It is EXACTLY the turbo you ordered.
There are two ways to fit the oil line so it is possible the mechanics fitting the turbo mucked that up. If Tweakit did, in fact, leave out the spacer or silicon by mistake, then sure, they made an error. EASY FIX. Tell them they left some bits out and get a refund for those parts.