your friend is already a registered nexon user ?!

wtp okay so i just made one account to do the friend referral thingy and went to send him the email and a notice pops up saying "your friend is already a registered nexon user" wtp I JUST MADE THE GODDAMN FKING HOTMAIL IT IS NOT A FKING REGISTERED NEXON USE pineapple YOU wtp FKFKFKFFKF


so im kinda asking anyone know what to do?