Couldn't withdraw

I registered with DS investment Limited and deposited 45,000 in total and I supposedly profited under their guidance. When I applied for a withdrawal, I was required of individual income tax which i paid then i was fined for scalping, saying that i tried to withdraw as soon as i started noticing profits but my account was 2 months old and i never for once asked to withdraw until now. I also paid this but then the customer service wasn't replying me anymore. These are professional scam artists at their best.