Bestbuy is authorized to sell Yamaha. If they sold you a faulty unit, they should replace it at their expense. Shipping included.
Be calm on the phone. Request your solution. Ask for their solution. Never get loud, or offensive. If common ground can't be found, inform them you need to contact Yamaha, and you will be in-touch.
Their relationship with Yamaha is more important than the shipping cost, or even replacement cost.