Is umarkets safe?

These are 100% scammers. They betrayed me. I deposited with them 700$ as insurance. When I would be prepared to withdraw my money , they asked me to pay 250$ separately to the Bank which is 15% of my withdrawal, I paid it. Then my account manager named SAM Matthews, told me that I will receive my money within 5 working days. And he disappeared and another scammer with the same company named Fabian Fontas contacted me to start working with him but I refused and I told him to solve this issue, but he asked me to pay more money to solve the issue. In addition to that, they also scammed 2 of my colleagues. UMARKETS 100% ARE SCAMMERS AND ARE THIEVES. Please stay away from them.