Someobe is bidding for one of items with no intention of buying

[2014_ikell]

I am selling an item that I no longer need  as a private seller. I have never used the item. It is generating quite a buzz as it is a popular item. I have received strange and threatening messages from a couple of members as well. The first bidding ended and was straightaway cancelled by the buyer. I relisted the item and this has happened again. I believe somebody is deliberately trying to sabotage the sale of this item. I really don't know what to do. Not sure how to escalate this to Ebay customer service. Ant advice would be really helpful. Thanks

[plpmr]

buyers cannot cancel and you need to cancel with - buyer did not pay - to get your selling fees back and they get an unpaid strike, then block them.

block the ones that are sending you unwelcome messages.