Price manipulation
The broker manipulates the price. They call you to invest in a certain product of theirs. Then you would suffer losses. However, because the price volatility is not too much, your loss would be small. Therefore, you would not choose to withdraw. Then you will probably be defrauded to make further investment.
Scam
The following is the original recommendation
manipulan precios
este broker manipula.los.precios , te llaman y te dicen compra tal acción y luego estás en perdida pero para q no sea mucho ellos mueven el precio así tu perdida es menor para q no te salgas y luego te inducen a otras operaciones en las que hacen los mismo