Experience on Roboforex was never been good

They are Scammers. Widen Spreads in ECN account from 2 pips to 75 pips in 1.5 seconds just to close your trade. How can we trade with this situation? And when we ask for an explanation they said that it was because of NZD rollover time. But how can the ASK increase in 30 pips and spread in 75 pips at the same 1.5 seconds and it was not noticed in any other broker, what type of liquidity provider it has? They are ok just until u make a profit,