I know how it is, I was working for a resturaunt and once my case was closed by my job agency and voc. rehab they took me from 25-30 hour weeks to 4 hours a week on sunday when the busses don't run. I tried to stay as long as I could Since I knew they were trying to get me to quit so I took a stand but I didn't want to be affiliated to a store that was breaking laws and food codes. So I ended up quitting and am now searching for a new job. so good luck.
ps I recommend reporting the job agency that just left you out on a limb to the better buisiness burough