I think the way EE have handled it is a bit harsh. So there acting wasn't good but that's what happens when you pick kids of the street and throw them in front of the camera instead of going to drama schools and recruiting younger staff members who've had some training. They should have been given him extra tutition on how to improve his acting and if that didn't work they could have soften the blow by writing Ben's character out for a year send him away a detention centre. They could have just told Charlie that they don't have enough storylines for him and that is why he is being written out. Then in a year revamp the character and bring in a new face.
As for Lucy well she's has had enough chances maybe her parents should have taken more responisbilty and getting her to sort herself out. If she can't find any other work she's only herself to blame.