I had something similar to me happen. I came in at a very low salary (which I would have rejected had I not been desperate at the time) - I already knew almost

I had something similar to me happen. I came in at a very low salary (which I would have rejected had I not been desperate at the time) - I already knew almost everything I'd be doing in that job, but they weren't sure about verifiable experience. I worked hard and tried to take on additional responsibilities and skills, but they didn't want me to (always a huge red flag in hindsight), my scheduled pay rise was repeatedly delayed for several months, then around annual review time, nobody got any raise at all. That was the point I had enough and quit - I'd already witnessed several of the best people there quit for better paying jobs prior to that. I still consider that company a nice place to work for, with nice people, but the work itself was unfulfilling and the pay very poor.