Very good! You must ask for information about a chargeback of your deposit(s).
Will it be possible. Visa and MasterCard have 2 different rules for the period that a client can request a chargeback. The minimum is 180 days so you could still have a chance.
What's more, you had not signed a power of attorney. They cannot trade on your behalf. They can only provide signals which you can follow, nothing more!