Hey AmaraRena,
Sorry to hear there's been difficulty reaching our live support team about the missing expansion pack that you pre-ordered. You're definitely on the right track - our live support team should be able to work with you to address this.
Please try using the Contact Us button at the bottom of this page. The NextStep chatbot should appear again and ask for some basic information before redirecting you to a new page that'll have the live chat option. If the chatbot still doesn't ask anything, please try using a different browser or incognito/private mode.
Let us know how it goes, thanks!