My current company does this. In everything else they are really great employers, best I've come across but I've only just found this out and I'm up for promoti

My current company does this. In everything else they are really great employers, best I've come across but I've only just found this out and I'm up for promotion. I'm actually furious. I dont understand what kind of stupid thinking made them conclude it's ok to promote with no salary increase. Hey expect more of me for the same money!