I checked the guides, and there doesn't appear to be an option for that. The only options at this point are, if someone outbids you, or if you "win" then I relist before the 7 days are up, since you do not want it.
Two days after winning, the winner may file a dispute and request the credits back. At that time, the seller will have 5 days to respond, either agreeing or objecting. That is the only option available, as far as I know, should tamonibe win. (Or anyone else who later changes their mind)