Points will expire 6 months from the date they were added to your account if they are not used. If you are opted-in to text messaging, you will receive a text message when you have points expiring within 30 days. If they still aren't used, you'll receive a second text message 7 days before the points expire.
If you believe you should have more points than what is showing on your account please submit a request and Customer Care will review your rewards account.