Investment cannot be withdrawn! Promised to ask other departments to deal with it, but the account was blocked

At first, I saw on the website that you can make a deposit of 250 US dollars for investment, and also arranged an online teacher for online guidance. At the beginning, there was a 50-dollar withdrawal, but then they were told that they could not deposit 3,000 US dollars. The attitude of the other teacher was not very friendly at first. On the one hand, I was also very worried about not getting the money back, so I still cooperated with the other party, but when I made an appointment for the next class, the other party did not call. I sent an email, and the other party said that they would tell the relevant units for assistance, but there was no news after that. I logged in again and found that my account was blocked! I have $750 of my hard-earned money that has never been returned! I have also reported the case, hoping that more people will not be fooled!