I was cheated out of a large sum of money.

I saw the ad on Facebook around the middle of September, and I trusted it because it said I could invest as little as $250 and it had the Amazon logo on it. The manager in charge, Zeki, told me to transfer $250 (35844Yen) to my account on 9/25. Then the manager in charge was replaced by a guy named David, and he told me that the current amount of money was not profitable, so I made a transfer of ¥289240 on 9/28 to the account name K)Polpa Aim. A few days later, I was asked to make an additional investment because of a big deal, but I never received any money back and I told him that I didn't trust him and that I couldn't invest as it was, but on 10/11 he transferred ¥72510 ($500 worth) to my account. I was told that there would be another big deal later and I was under the illusion that I could make a lot of money since they showed me how much it had gone up last time. However, they told me that due to the system, I could only invest from $10,000 and that they would refund me the money as soon as I made a profit this week. I was told that if I made a profit, they would refund me as soon as this week, so I reminded them repeatedly that I would definitely get my money back. I emailed my account manager every day and in the meantime, my account balance was getting smaller and smaller because I was still trading with WebTrader. I emailed them and asked them to take responsibility for the damage caused by the sudden loss of contact with the manager in the first place, but all I got was the same response. A few days later, I received a phone call from a guy named Tom who said that David, the manager in charge of the case, was sick and was taking a leave of absence. I was so mad that I complained a lot and asked for a refund including the amount I lost, but he said don't worry, I'll get it back and I'm sure I'll make a profit, and he forced me to trade with him again and I couldn't contact him again. I was told that David had voluntarily resigned from the company, but he insisted that I refund the money. In the end, my balance was about $70.