Wait it doesn't give you an option to buy in 'my games'.
- Go to the 'my games' tab in Origin.
- Hover over your 'The Sims 4'.
You'll see a little screen come up with an 'i' and a 'play/download/install' button.
- Click on the 'i', you'll be taken to a different screen.
- Scroll a bit down and there you'll see all your expansions, game packs and stuff packs.
Make sure you do that.
If it's really not there, you need to go to paypal.com and check if the game was bought.
Make a screenshot of your payment page, and contact EA:
http://help.ea.com/en/contact-us/new/
If you don't see it in PayPal, you never bought the game.
Community Manager
