We are sorry that this happened to you 😢.
Unfortunately, once a bid has been made we are unable to cancel this. There is a security confirmation process where we ask users to confirm that they are happy to bid the current winning bid to prevent scenarios like this. So, whilst we completely empathise with your position, we can only recommend that you double check the numbers before submitting future bids.
If you believe there was an issue or bug when submitting your bid, please send a request on the help center.