make sure you booking dinner reservations in the correct order. with the free specially dinning package you need to book fixed price restaurants like Teppanyaki and Moderno first and al la carte restaurants like cagneys and le bistro last. if you book things in the wrong order, the system will make you pay if it thinks you dont have enough dinning credits with your page . you will need to call again and tell them to remove all of your dining reservations and then rebook the restaurants in the correct order
If Teppanyaki only shows availability for 4 or more people then that means that time slot is kind of full, try selecting a different time or date. When i book Teppanyaki i always select for 2 people and i never charged anything