Have phoned the Post Office and they say there is nothing they can do. I ordered mixed notes and that's what they have given me - end of. Have xplained that that is a lot of money to cash all in one go and she still says there's nothing i can do except buy it back at a loss. I explained it wasn't my fault i'd got a $500 TC and she said it was hers either as i'd asked for mixed notes. Looks like i'm stuck with it and possibly won't be able to use it.