If they allow you to trade i.e have opened an account they should honour their obligations, no excuses. They can't afterwards say "we made a mistake."
GUILTY
Any suggestion what should I do next???
"On 18 Nov 2014, SVS informed me of closing my account and would refund me the initial deposit only (i.e. remove all the profits I've made), because I didn't send the appropriate documents for account opening but they somehow activated my account wrongly."
This seems to be a very common excuse given out by scam companies not to pay their clients.