Did you open a non payer dispute against him? You can do that after 4 days from date of sale and then can close exactly 4 days later at the earliest. That way you get your fees back and he gets a strike against his account. If he gets two strikes, he will find he can't buy from a lot of sellers who have blocks in place.

See if you can still open a case against. him. Go to the item on your selling page and click the dropdown at the right and select Resolve a Problem. On the next screen tick that you sold an item and didn't get paid. The next screen will allow you to open the case. Go back exactly 4 days later (to the time) and close it.

Set up buyer requirement blocks to stop any serial pests. Click this link, which takes you to the buyer requirements http://offer.ebay.com.au/ws/eBayISAPI.dll?BuyerBlockPreferences

Then set them as you want them. The tightest settings are:

Non payer strikes, 2 in 12 months

Tick locations you don't post to.

Policy violations set to 4 in 6 months

Buyers who haven't gone through phone verification, set to 5

Tick the box so blocked buyers can't contact you.

Submit.

Also add pests like this to your blocked buyer list so they can't buy from you again. http://offer.ebay.com.au/ws/eBayISAPI.dll?BidderBlockLogin

It shouldn't have taken so long to get this sorted. In future, open a case after 4 days if a buyer hasn't paid. If they do pay, the case will automatically close.