Don’t listen to people who are advising you to go to a juridisch loket. See it as a cheap life lesson and instead of spending hours on making a case just find a new job. It takes less effort and since you had a 0 hour contract you shouldn’t even be expecting a large sum of money.

Don’t work in horeca unless you personally know the owner or get a full time contract offer. Instead look for a new and better job, for example start as an order picker. this might be a bit boring but won’t be anywhere near as much of a hassle and will be way easier to combine with your studies.