Bad ebay buyer, is there anything I can do?

So about a week ago I purchased an iphone 5 that was stuck in restore mode thinking that I could simply restore it and either keep it or resell it. After not being able to get it to work I took it to the Apple Genius bar and they told me that it was a hardware issue. Not knowing anything about the inside components of phones I looked to sell it on Ebay and listed it. Literally 5 seconds after listing it the seller bought it and also attached a message asking for the IMEI number and told me that he would pay right after he got it. I provided the number and then he emailed me again telling me that "find my phone" was on and that it was useless to him and asked to cancel the sell. I figured i didn't want any bad feedback so I agreed to cancel and he went on his way and I relisted the phone. 3 days later, today, as the relisting period was ending he purchased the phone again and asked to see the IMEI number again. The images were the exact same and the description was very close to what it was before. Anyways Is there anything I can do to either force him to pay or block him from any auctions I have? Would an unpaid Item case be best?

Ignore the email, send him the Final Invoice, open an unpaid item case after the wait period (then relist), leave him negative feedback.

Ebay procedure is that you NEVER ship before receiving full payment.

I never liked ebay. Ever.

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