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unable to withdraw

Titan capital limited. now merged in Yun Shang hui xin limited. 730007 is my id. (yun shang hui Xin Limited)before it was 308134(Titan capital limited)I invest money in trading because of profit. but not withdrawing my money. 2800 $
they asked 20% tax. i deposit. after they say you did not trade properly, trade many time in a single day. CS asked me to deposit 500$ more to investigate my account and withdraw money.they are not withdrawing my money and asking for money again and again. I deposited total 1800 something with 566 tax, I trade and make 2831. but not withdrawing still. they if you expose our company, they take legal proceedings against me.
please help me to withdraw my money.