ouch

hi iam new to the game over the past couple of months and just made my first massive mistake i tryed putting a level 3 scarred llama mage gold foil card on the market only to put the wrong price in as soon as i did it i realised what i had done and went to take it back off the market it was literally 5 seconds it had taken me to take it back off but it had allready been bought it works out i got about 3 dollars for a $1,500 dollar card i have appealed to the payer who purchased it but im not holding my breath for a good result looks like im going to have to take this on the chin and learn a big lesson absoultey gutted iam.