First, understand your rights:
Generally, false advertising laws say that consumers have proved their case if they show: (a) that the advertising was false or misleading; (b) that the falsity was “material,” often meaning the company lied about something important; © the consumer saw the false advertisement; and (d) the consumer relied on the false advertising in purchasing the product or service.
At the end of the above link is where you may speak to an attorney for free consultation.
The biggest evidence of False Advertisement (ie “bait and Switch”) is seen here, in The Culling of Stratholme video. Note that Pre-orders were available prior to this footage being seen, and Blizzard allowing this footage out is a form of advertisement:
Hope this educates some people.