Not able To Withdraw

https://apex-optioninvestment.com/secure/account/dashboard Few Day Back I Invested 500$ in this Platform but Was the Sales Person Said I can Withdraw in 1 week After putting the Request for withdrawal he said the Signals have exahausted you will be unable to Trade and Withdrawal will be possible only after you Deposit 1000$ for purchase of Signal Now the Account Balance is 6500$ and the Person is Asking me to deposit another 850$ to be able to Withdraw the platform was shut In December and The Person Again Contacted me with new number and now he’s asking for 850$ for me to Withdraw.