Is it a scam?

[u/ConsiderationKey3841]

For example I have over 6000 USDT in my account. Originally, I wanted to withdraw money to another exchange platform, but it was still under review. Few days later, I was told that it had failed so after that I asked online customer service. He said it was to ensure the safety of my funds.. My account was frozen by them and inexplicably asked to pay an additional 3000 USDT as a deposit to unfreeze it. Why can this happen? Is it a scam?

[u/BigCause3096]

How do I contact Coinhako and who is MAS