As a seller, you can cancel bids on eBay in the following situations: when you agree to a buyer's request, when the item isn't available anymore, if you made an error in the listing, or if you're concerned the bidder might be fraudulent.
What Happens if You Want to Withdraw Your Bid After an Auction? In most cases, the auctioneer and seller will expect you to proceed with the sale.
Listings with Bids or Offers If the auction ends within 12 hours and has bids, you cannot end the listing early. If the listing ends in more than 12 hours, you can cancel the bids and then remove the listing.
Your listing will no longer be active on the eBay website. If you end a listing that has bids, any bidder who did not win will receive an e-mail explaining that his or her bid was canceled. The message will also indicate that the listing was ended early.
Effects of ending an item listing early The listing ends as a successfully sold item. If a different EndingReason is specified, any bids are canceled and the listing ends as an unsuccessful listing (item unsold).
Buyers can request a cancellation, but it's up to the seller to accept or decline the request. If multiple items were purchased as part of the same order, then all items in the order will be cancelled. An order cannot be cancelled if: The seller has dispatched the item or the item has been collected in person.
If the auction ends within 12 hours and has bids, you cannot end the listing early. If the listing ends in more than 12 hours, you can cancel the bids and then remove the listing.