Landau Jewelry - fake advertizing

My Husband was told he was purchasing jewelry that was worth $684.00 @ 80% off that price. What he purchased was costume jewelry that was not even worth the $150.00 he spent. The store Associate out and out lied about the true value and he thought he was getting a really good deal. The receipt of course states very clearly that you can only receive a store credit and not a refund. This store should be put out of business for their deceptive ways of misleading the customer. We were told there is nothing that they will do except a store credit. Please stop their deceptive selling.