Micro drama: forced call, 6hr turnaround, toxic AD

We wrapped at 1am and the call sheet for the next day said 7am. That's a 6-hour turnaround. When I brought it up, the AD literally said 'this isn't union, we don't do turnaround.' The lead actress was in tears by day 3. The director was oblivious. I walked on day 4 and they threatened not to pay me for the days I'd already worked. I got paid eventually but it took 3 weeks of emails. The rate was $400/day which would have been fine if the conditions weren't abusive.