Cancel bids for the auction system.

Right now I am selling an item on the Guild Wars Guru auctions and there is a person I think that bids on items, just for the purpose to mess up the auction.
I was looking around and didn't find a way to cancel that bid.
Is there any way to cancel a bid in the auction system right now?
Because, I don't want my auction to be ruined because some guys decides to be a dick.
If there isn't an option, I think it needs to be added immediately.
Also, how much does it take to get someone banned from the Guild Wars auction system?
I think that guy that bid on my item definitely should be banned.
And how would Guild Wars Guru ban him?
By ip? By account? By email?

Right now it looks like account, and even then it is pretty vague.
I'll wait for a reply before I get into anything though.
Thanks for the time.

P.S. I'm sorry if this is in the wrong topic. I know this is a suggestion, however it really isn't related to Guild Wars.

Oops, I just noticed site feedback. Sorry, I'm a little tired and I just woke up. Can some mod move my topic there?
I would delete this myself and repost it, but it wont let me.

you should have an option to refuse a bid from a bidder. Most auction systems have it in seller options. just add the bidder account to ignore and they are unable to participate in your auctions from that point on... I can't seem to find that option in GURUs system currently. so if it was added some time in the future it would solve your problem...

I feel your pain.

This Auction

Took a look at the current highest bidders feedback score and noticed several comments about his account being fake. I've contacted the user via the system asking for a response before the auction ends but not holding much hope.