Welcome to the forum Frank, you'll find the members on here are a friendly and helpful bunch 🙂
sorry to hear of your problem, are you sure you don't have any consumer rights?
with regard to turbos my advice would be to either get a genuine new one or a genuine reconditioned one as the aftermarket turbos can be hit or miss. Also make sure what ever turbo you buy comes with a decent warranty. You'll be looking at around £900 for the job. This is what it cost on my sisters mk4 golf.
cheers
Steve