Communication doesn't seem to work in Bronze. Advice?

Taking into account that a good sum of the players in Bronze are children (17>14ish), what should I do with this problem ? Pinging gets through on some occasions, even verbally telling them (ex. Akali is roaming, coming bot) ooccasionally have an impact on thier actions. Then they wonder why lane 'x' is fed. Its a pretty big issue that I keep coming across and it feels as if map awareness becomes less useful when noone is taking into account that there is ex. clearly a Jarvan waiting in a warded brush to gank them, despite pings and mias. The hell am i doing wrong? Should i just not call Mia and let them die or something? xD Another example is during teamfights, I'll let my team know that I'm going top to farm and that I'll group after I push the lane, despite my saying that they initiate a 4v5 teamfight and act surprised that they didnt get and ace when 1 or 2 lanes are behind? I dont get it. Help is greatly appreciated.