Non disclosure of important information

When my husband accidentally broke the screen of his Samsung S4, he went to the Samsung shop in Brooklyn where he was informed that he was entitled to one free screen repair. He was however not informed that this privilege would expire, nor was he provided with any documentation relaying this. When I returned to the shop today for the screen to be prepared, I was conveniently informed that the contract had expired only five days ago, and that it would now cost about R1200 to prepare the screen. Since this important information was not disclose by Samsung, we feel that the screen should be prepared free of charge.