Why hasn't ebay seller shipped item yet?

I bought an iPhone 5c off eBay. It's free shipping and guaranteed fast shipping. It's from Australia too and I live in Australia. I still haven't got it after 10 days. The estimated delivery date keeps on changing too. What can I do?

Maybe the seller only ships once a week? Maaybe the selller is on
hoilday? Have you contact the seller? We can't read the seller mind

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