You're supposed to get an email from GM, not the dealer when the chip is in and to go in and have it installed. The dealer you purchased from should have a letter in their deal jacket that they were supposed to give to you so you can bring that letter in once you've got the notification from GM the chip(s) are in. If you do not have said letter, then you need to contact your purchasing dealer and get a copy of the letter so you'll be ready once you're notified by GM. That is how it's supposed to work. Your dealer won't know once you've been notified by GM, hence the reason for the letter at the time of purchase by the dealer. All of us that are missing chips are being dealt with the same way and you should have received a small discount at the time of purchase because the chip(s) were missing.
Legally speaking, you don't have the chip(s) and they gave you a small discount for that, so there is no legal recourse. We're all at the mercy of the manufacturer right now for the notification.