Have you called Customer Service yet? The Explorer's Pack is an entitlement that Zenimax attaches to your account by way of a code you should have gotten when purchased and applied to your account at https://account.elderscrollsonline.com/
Ravalox Darkshire Developer of Wykkyd ESO AddOnsandRavalox' AddOns Co-Founder Brotherhood of Redemption ESO Branch Brotherhood of Redemption (A DC faction guild) http://eso.borguild.com *Always accepting worldwide applications for the PC NA server*