There is no customer service center at Bungie so there is nowhere to call. What are you having an issue with? If you purchased something on the Bungie Store, they have their own separate support team with FAQ and Customer Support links in the footer of each page to contact them. If you have an issue with the game, browse the Help Articles or ask for help in the #Help forum. If you have an issue with a game/expansion purchase, you will need to contact the retailer you purchased from.