Overdue salary increase

When I had my last performance review from my supervisor I was told the matter of salary increases needed to be handled by the owner of the company. I did this and made a presentation of my contributions to the owner. I was told he would need to get together with my supervisor to discuss it. After nothing happened, I twice have gone to my supervisor to request they get together. I would like to get this settled tactfully and professionally. I need suggestions on how to bring this matter to a close; to get them to just say ‘yes’ or ‘no’. (Just in case they are stringing me along, I have begun casually looking elsewhere to cover my bets and have had some interviews).