Yes, I'd expect an email to confirm he got my mail. I know I would feel worried if I didn't hear back- if it were me I would ring again and leave a message saying I'm worried and would appreciate a callback. Do you think doing that might help? One thing I've noticed is that usually when I follow up on these things and say explicitly that I am concerned about something my therapist can then clarify the situation, and I don't need to worry anymore.