I WANT TO REMOVE MY NAME FROM A JOINT BOND

I HAVE BEEN TRYING TO REMOVE MY NAME FROM A JOINT BOND AFTER MY DIVORCE AND BECOUSE MY eX HUSBAND DOESNT QUALIFY FOR THE HOUSE ,FNB DOESNT WANT TO REMOVE MY NAME ,ITS BEEN OVER 2 YEARS NOW AND STILL THIS THING IS STILL HANGING ,,THEY EVEN TOLD ME THEY CANT REMOVE ME HOW IS THAT POSSIBLE .NOW I NEED TO BUY A HOUSE OF MY OWN BECOUSE OF THAT BOND I CANT