It must be hard working like that. You're voice can't be heard by them. "We should be thankful that you have a job." It might be true in some aspects, however it shouldn't be like that.

In this time of pandemic they should take good care of their workers. And for me if you don't really need that kind of job, you're not desperate to earn yet. Why not resign and find another. It's not easy maybe but at least you can be so sure that you as an employee has value.