This is a fraud. Started with an add on facebook related to Quantum AI. Wanted to try it out so registered and they asked me to open an account with CAD250, which I did using my credit card - which was never charged. A few days later got a call saying it’s earning season and if I could put more money it would help get higher returns. Asked to transfer using but coin cause it would be much faster. Bought bitcoins on NDAX and transferred. The whole investment showed great returns. Repeated the same after a few days and I transferred bitcoins worth 10000. Now when I wanted to withdraw some money, they came back asking me to deposit more bitcoins with them to pay for tax on the gains I made. I told them to deduct the tax from the profit but they insisted that I need to pay for it upfront.