I'm at least 20k underpaid and during our last review period I mentioned this and was told all salaries are being reviewed to get them inline an competitive.

It's been months and I received the same answer when I asked.

They're also actively hiring to expand our team and the upper end for the same role is 50k more than I'm currently getting.

When we hire someone new I'm definitely inquiring how much they're getting... It's unfortunate companies treat people this way.