Just fly Sell airline tickets Internet

They charged me for seat selection and authorized a charged without notifying me that I would be charged. When I finally got to the airport, because of different circumstances I was requested to board a different plane at a different time. Well, just fly charged for me seat section without my approval for seats I never even used. As I called justfly, they told me that after purchasing my ticket I was not allowed any type of refund. I spoke with an associate for 10 mins and then kindly requested to speak with a supervisor. After speaking with the supervisor Carlos, he assured me that there was nothing he could do not anyone at Just Fly because of the policy. I told him I never agreed to it. He said if you did not say disagree with it at time of purchase than you automatically agreed. He then began to tell me for 20 mins that I need to pay attention to policies and I am never going to get my money back. Just Fly is a rip-off. I’d rather buy my tickets directly with the airline.