I realize I am 2 days late getting to you, and right now I only see one invitation sent from your account and it was accepted.
To answer your questions:
- We do not have a way to resend, however they will be sent a reminder after 3
days if they do not respond to the invitation.
- You can use a separate address, and that would work fine.
- No the old one would not be refunded. The implicit assumption is that you
are sending these invites to people who you know who want one, and the expectation
is that they will accept.
- Invitations are not refunded if they expire, but that's something
I'll bring up with the team.
If you still need help, please let me know what I can do for you.