If you have a question about your invoice, please get in contact with the auction house directly, as they are the ones to help here!
Quick note:
When you bid on an item at auction, this is a legally binding contract and you will be required to pay. If you no longer desire the item, or you have any questions of lots on your invoice, you will need to contact the auction house and agree a resolution with them directly.
Before you bid, remember to check the payment methods accepted by the auction house.
Find a list of auctioneers here.