Always ignore the email and wait for a call. The email is automatically generated by JAS (the hiring system) and has no relevance to the actual orientation date/time.
This happened to me but I would call, sometimes they take a while to call on their own but once you show you are fully committed they will want you to get started as soon as possible.
As others have said, ignore the e-mail. HR may not be ready for you to go through orientation yet (they prefer to have more TMs in each orientation), so they would contact you when they have a date.
Thnx guys/gals I called the store and they said not to listen to the emails. Then they called me a few hours later and I have my orientation set for Friday.