"Not polite or helpful"

I checked in at the front desk and was told to follow the black line to the relevant waiting area. I walked past another staff member sat behind a computer and said good morning. They asked if I had checked in. I said yes I had spoken to the person at the front entrance. They directed me to take a seat. I waited for 20 minutes  and then went back out to the 2nd person to enquire if there would be much more of a wait. It then became apparent that I needed to have checked in again with them. At no point had they or the first receptionist explained this. I pointed out that it would have been helpful if they had told me this when I had spoken to them earlier. I felt their response to me was rude and I don’t think they should have a patient facing role if they can’t be polite and helpful.