I would, they should clearly write that its not a full sized version - and were probably purposely misleading you if they didnt. I know of a USA seller that does that, and has received quite a few negs/neutrals for this - even though they are authentic.
Perhaps send a message telling them that the auction was misleading and you arent happy about it - you never know, they could give a partical refund if they dont want you to kick up a fuss (not that this would be an ultimatum).