how do i link this and unlink that? really need to know to get my clan underway!!!

how do i unlink a PSN account and link my other one over it? i have recently this week got destiny companion to only come to the conclusion that i've linked the wrong PSN with my Bungie account, i have my PSN and Facebook linked together. i hopped on my Bungie by Facebook signin and tried to unlink my wrong PSN and link my right one but when i did it, it had linked the one i was trying to unlink. Now the in the Hell do i do to fix this Bloody issue?????? Just Someone help me,