Non repaint indicators really show you the truth and the accuracy of the indicators. If it repaints, then it makes no sense in using them because they will always show that it wins.
I had my experiences of being scammed as well it was a telegram channel called Forex Army. As soon as they got my money, they blocked me and deleted the chat. :(
I don't think all EA's work. You have to experiment a little on a demo account before you invest in any EA. Sometimes you may end up with more losses than wins