can anyone help me unlink a playstation account and is it possible to unlink it from my new riot acc

can anyone help me unlink a playstation account and is it possible to unlink it from my new riot account to an old one on the same playstation account because my old account has alot of skins and i need help to unlink my NEW riot which has no skins and everything and i want to link my old riot account to the same psn account. do i have to contact riot?