[daniel-s]

I don't understand why you expect more from them. You are selling employment services on the free market. You told us yourself that you are yet to find someone else offering to pay you the same or more for the same thing.

That's precisely how your bosses are thinking.

The key to negotiating job situations is to have several other offers lined up. Fix your CV and skills so that you're more desirable and the problem becomes considerably more tractable.