I thought altcenedge was legit, but now I’m stuck. What should I do?

I invested $3,000 into altcenedge and saw a nice profit at first. But when I went to withdraw my money, they told me I needed to pay a "transaction verification fee" before I could access any funds. Now I can’t get my money, and I’m starting to suspect this is a scam. Has anyone been in this situation with altcenedge? How do I recover my money?