I am an individual trader ... nothing to do with roboforex.
and my gut feeling is that ...you may not be following the required regulations...
A simple example is ... if you did not funded by skrill then you can not withdraw to skrill account.
I have traded with FXCM, forex.com, even dukascopy.
And you can do nothing(can not withdraw) if you don't follow the regulations.
If you like to discuss your case ..i can point out where are you missing the regulation part.