VirtualStaX Support.

Automatic Cancelation

At least 5 bids and a bid pool worth $100 or more are required for the auction to end successfully.
If the bids are less than 5, or the pool worth less than $100 after the 7-day period, it will be automatically canceled and the bidders will receive a refund. 

Canceled by Bidder

As a  user/bidder you  can cancel a bid when you receive a notification that your bid is too low.  You have the option to increase your bid, or cancel your bid.  This is  the only instance where a bid can be cancelled by a user. 

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