Galaxy s6 edge not notifying of text message even when phone is locked

[AC Question]

My Galaxy s6 edge is not notifying me when I receive text messages, the notification light doesn't even come on, the only way I realise that I have received a message is because the little number 1 comes up on the icon before i open a message. I have checked my settings and notifications are on, is there something else I can do??? Please help!