Bitcoin Cash – Is it a Scam?

I created an account on karcof.com so that someone can pay me. Once the account was created, the sender sent me 41,000 in BTC. Now I have a balance of 41,000 in my karcof account. I tried to withdraw it, but it said it was considered a third-party transfer and I had to complete the Bitcoin deposit. The deposit is .006 BTC. They said if I deposit BTC into my account I already have 41k then I can withdraw the money to my account. People say it’s a scam, but after doing my own research, I’m not sure how it could be. If the BTC is already in my account, then am I the owner? Please help It’s only $277 dollars but it’s still a lot of money if you don’t have any. Does this seem legit?