They've fulfilled their obligation as far as delivery is concerned. Unfortunately, the fact that the goods have been seized by customs is your problem, not the carrier's. Don't expect a refund.
You should always read the Terms & Conditions before engaging a delivery company. It's just the same as buying insurance. Most people don't bother to read the T&C's of the policy until something goes wrong.
If the goods have been seized at Fethiye it may be worthwhile getting a Turkish friend to make an appointment for you with the manager there. He speaks reasonable English, but I'll warn you now, he's not a great fan of English bureaucrats as he had his visa application turned down a few years ago and he also doesn't take too kindly to foreigners who don't make an effort to speak Turkish. You may be able to charm him though.
