Hired in Sept

I was hired in Sept, making min wage which is $13.95 an hour (pretty small amount considering how big of a company Safeway is), anyway, I was working M-Th, 6hrs a day cause of having children…we left for a fam vacation, and when we came back I found out that my hours along with a few others had been cut AND they hired 2 new people, but yet when I asked for more hours they said there aren’t any….not to mention the whole union thing keeps taking money out of my paychecks even after I paid everything off with them….i tried to call my union rep and no answer and no callback….oh! And my last check was $2 for 2 days of work😂 wtf am I supposed to do?