GameStop review: I was misgendered in this store!

I was trying to return a game and get a refund and the cashier refused to give me my money back. He kept on calling me sir when it's obvious that I'm not. How many times should I have to say "IT'S MAM"?!? I think that they are just going to continue to disrespect transgendered people in this store. I plan on telling the entire LGBTQ community about this! You are going to loose money over this!