I have had many problems with this servicer, but also when things are running smoothly I've learned they're really still messing things up.
For exactly, you figure that your payments are being made so they're counting as IDR. Maybe not. That's why I request my counts annually. But most reps ask me if it's for PSLF (no) and say they can't do this. They can. It takes 3+ phone calls or countless emails to just get what I asked for.
Another situation is they aren't abiding by the REPAYE rules of applying the gov partial and full payment of interest. I never would have known if I have sat down and done the math. Most borrowers don't even know this and/or assume it's being done.
They handle the accounts this way because it means they will "accidentally" make more money and the Dept of Education isn't holding them accountable. It's frustrating.