I wouldn't waste my time, they only lie or know no better.
See - you've made up your mind.
You don't seem to understand that throwing around the accusation, "liar", without any proof at all, is unkind, unfair and unchristian.
I don't know of anyone who's been there.
But you could go online, or down to the travel agents, and ask questions about the place, people who have led tours to the place and so on
Except that your first response applies here too; you believe they'll all lie.
What a sad little world you must live in; to be so mistrustful that everyone else opposes you.
What have people suggested ?
I think someone suggested releasing a balloon with a camera attached to it.
Other people have posted photographs and said that if we were on a flat earth, a certain place should be able to be seen. I think someone challenged you to go to a certain high place and take photographs.
And I said that you could speak to travel agents, write to airline pilots to ask about Antarctica - or even go there yourself, to see for yourself. Such an action sounds pretty drastic, but a) researching, and booking, the trip would tell you more about the country and b) at least you would be able to say "I've been there" and show us photos of this supposedly heavily guarded "wall of ice that circumferences the earth."
In this day of the internet, doing a Google search for "Antarctica" is simplicity itself. Even I, a technophobe, can manage that. There are many pictures and articles available. You could, as I also suggested, watch David Attenborough's programmers on the place.
Somehow, I have the feeling you will brand all those people as liars or fakers, though - with no evidence at all.