Gridporte showed my Coinbase crypto growing but asked for my seed phrase to withdraw

I was contacted through social media and convinced to move crypto from Coinbase to app.gridporte.net.

I invested about $31,000 and the Gridporte account later showed more than $102,000. When I tried to withdraw, I was told to reconnect to my Coinbase wallet using my 12-word phrase. Coinbase warned me not to connect my wallet to that site.

When I asked for another withdrawal option, Gridporte said I had to pay a 5% fee upfront. They would not deduct the fee from the balance on the platform, which made it clear the account value was being used to demand more outside money.