Restaurant.com

I purchased two of the 2$ for 5$ voucher at Granby Bistro & Deli, 225 Granby St
Norfolk, VA 23510 one for me and one for my friend. And when we arrived at the restaurant and ordered food we made sure to meet the minimum spending amount of 10$ each. However when we showed the voucher to the clerk at the register, he said he had no idea what Restaurant.com even was, and when he contacted the manager they said that their company had no such account with the website. We ended up paying full price for the meal to not cause any inconvenience.