Let's think this through. . . . .
You deposit money.
You ask for a withdrawal, which is denied, delayed, etc.
Instead of getting your withdrawal, an unauthorized charge is placed against your card.
Continued delays in your withdrawal result in you sharing your story.
Now "Jack" wants you to hide the facts of what happened. If you don't, he's steal your money. If you do, he'll give you "a chance" to withdraw some of your money.
Tell Jack that his words brand him as a criminal and a blackmailer. Tell him that anything short of processing your legitimate withdrawal attempt immediately will prove what kind of person he is and what sort of company he works for. Ask him to come to this thread and explain himself.
In the meantime, contact the disputes/fraud department of your credit card's issuing bank. Explain that there was an authorized charge where the promised service of withdrawal was denied. Explain that there was another charge which was unauthorized and that all attempts to get that refunded/withdrawn have been denied. Ask about a chargeback on both credit card charges.