Alright here is my personal experience.
Pay for your transfer > grab the items > make a ticket the day after > say you did a stupid mistake, you have no more founds and already miss your friends > they will offer a roll back > refuse, say you in the meanwile bought a couple of items or hearned a couple of items > they should normally offer you a transfer after the 3 day cooldown ( blizz pays for it ) and if you are lucky you will be listed to be refounded of the initial transfer.
Did it 4 times, got my cash back 4 times.