DesupercoinTrade has just added a $2,600 “system activation fee” on me

This is Ranking of Global Forex Trading Volumecompletely out of line with what was agreed upon when I first signed up. I’ve already paid for identity verification, AML checks, and platform fees. This additional fee seems to have appeared out of nowhere. They say it’s a system activation charge necessary for finalizing the transaction, but I’ve never seen a legitimate platform require something like this. I’ve asked for proof or legal documentation that shows this is a legitimate charge, but they’ve refused to provide anything. I’ve used other platforms for years, and this kind of charge was never required. It’s starting to feel like they’re just inventing these fees to keep me from accessing my money. If anyone has dealt with a similar situation, I would greatly appreciate your advice on how to proceed.