To retract a bid on eBay as a buyer, log into your account, go to "My eBay," then "Bids/Offers," find the item, and if available, click "Retract a bid". If you can't retract it, you can contact the seller to request a cancellation, but as you found out they do not have to accept your reason to cancel.
Here's a more detailed explanation:
Login to your eBay account .
Go to "My eBay" .
Select "Bids/Offers" .
Find the item and bid .
Check for the "Retract a bid" option .
If available, click on it.
If not, contact the seller to request a cancellation.
If you are able to retract the bid, follow the prompts to confirm .
Be aware that you can't always retract a bid once it's made .
Remember that once a bid is retracted, it cannot be reinstated .
