Deceptive advertising

I've been bed shopping for 6 months, and saw a bed that I liked at Furniture World Superstore. Since January, the marked price tag has been $699.  F.W.S. had advertised a storewide 50% off sale, so  when I went  to actually purchase the bed I was expecting a price of around $350. The price tag read $579, clearly not 50% off. When I questioned the salesperson, I was told that that IS 50% off.  Called the Lexington store for clarification, and after waiting on hold for 7+ minutes, called back to speak to a manager. This particular manager (Tom) informed me that the 50% off was applied to the MSRP, and NOT to their everyday price, hence the $579 price. How is this truthful advertising?
Filed a complaint with the Lexington BBB, not expecting much of a resolution.  F.W.S. handled the complaint by simply re-stating their position, NOT offering any sort of resolution.  It's sad that the BBB will let them keep their accreditation, thereby encouraging less than fair business practices.