How do I go about blocking bidders who has retracted their bids on my items?

[depechemodegirl68]

Hi all,

just to ask how I can go about blocking bidders who bids on my items and then after a while retracts their bids? I'm getting quite fed up with this now,as it's been happening far too many times now and I don't see a reason for wanting to do any business with people like that. I'm a private seller,so it's getting increasingly frustrating and it's also annoying. It never seems to be a wrong amount entered etc,just bidders who placing a bid and after a few days/or a week retracts it. For some sellers it might come across as petty etc,but it does irritate me,as it's never a reason provided to why they've retraced their bid,well I can't seem to access it,I've tried clicking on the link provided by eBay but I've never been able to see why they've retracted the bid. I could accept it if they've retracted the bid within a few hours,but not after several days,just frustrating as I'm try my hardest to sell my stuff. Saying that,what I really want to know is how I can go about blocking a bidder who is doing this,as I would feel secure in my knowledge that I'm  stopping people like that from placing a bid on any of my items. Thanks in advance for your help guys,cheers