$39 KIOSK charges for United Airlines Premier Line? Very Sneaky!

I was checking into my flight at SFO at the united terminal and was asked at the check in machine if I wanted first class for over 100 dollars. I decided no and clicked to the next screen. Then they asked if I wanted more legroom for 39 dollars. I said ok. Then I was asked for something called "premier line" for $39 dollars and I made the mistake of assuming that this was the same legroom upgrade that I had selected before and that perhaps my credit card had a problem. I said OK. Then I had to pay 40 dollars for my two bags, ok, fine. All said and done, they charged me 39 plus 39 plus 40. I immediately asked a flight attendant to change and she scolded me for not reading more carefully. She then agreed with me and said this tactic is actually BS and that I should go online and ask for a refund. Amazing! What I find most deplorable is the fact that the amounts are both $39 dollars. If the amounts were different I would have likely caught the error. United Airlines seems to be using some sneaky tactics. The woman checking in next to me also had the same thing happen to her. I have requested a refund and we'll see if I get it. My main gripe here is that this tactic is sneaky and that UA should at least be able to give you a refund at the check-in counter when the error is caught. Bad customer relations people!!!