You can withdraw your offer or counter-offer after 3 days if it hasn’t been accepted by the seller. To do this:
go to Menu > My offers > Placed to access all your offers.
click on the relevant offer/counter-offer, then on the 'Withdraw offer' button.
Once you’ve withdrawn an offer or counter-offer, the seller can't accept it anymore.
You cannot withdraw an offer that has already been accepted. Offers are binding and you are required to pay for the items that are in your cart and marked as 'sold'.