A bid may be canceled by the buyer in some cases if the retraction meets the following rules:

• You make a typographical error and enter the wrong amount. For example, you bid $999.00 instead of $99.90. If this occurs, please contact ArtByUs.com Support immediately after you made your bid. 
• You cannot contact the seller. This means that you tried to call the seller, but the seller's phone number doesn't work, or that you have tried emailing a message to the seller and it comes back undeliverable.