company refuse withrawal

i have put 2k usd in tge platform and work with trader named denis kobb from netgerland and then he traded for me since he has 12 years experience like pretending, after 4 weeks my balance became 3,5k usd , i want to withraw money then the company refused and told me that i need to deposit 3k usd then i can withraw, be carreful with this fake company, they are scammer