Be glad someone cares enough to follow up. I have never had one single contact with my admissions counselor. She does not even return messages we leave. Thankfully I have a great ALO!
I got the same call yesterday. The caller identified himself as working for the Air Force Academy admissions office, then stated that I have my application complete and asked if I had any questions. I replied that I had already recieved and accepted an appointment. The caller then said "I wish they told us these things", congratulated me, and hung up. I'm guessing they were are just given a list to call and don't actually have the candidate's page in front of them.