Hi,
You should have gotten a product key or discount code from the vendor or retailer if you bought an AMD CPU that was supposed to be included in a game promotion. In order to learn more about the deal and get the code if you didn't receive one, get in touch with the merchant or seller where you made the transaction.
You can try contacting AMD customer support (https://www.amd.com/en/corporate/contacts.html) directly if the retailer or vendor is being uncooperative or won't give you the code. They might be able to help you get the code or fix the problem.
You can call AMD's customer service line or use their website to get in touch with them. When calling them, be sure to have your purchase details and proof of purchase at the ready.
