eBay

What do you think of someone who buys three of your auctions, you pack them all up nicely and print the shipping label, then they tell you they want them shipped separately and they will pay for a 1/3 today, 1/3 in two days and 1/3 at the end of the ...

I'm ready to relist before all the other people who made best offers disappear. Question is, should I cancel or report unpaid item? Which option assures me this rude jerk can't leave me negative feedback?