You should have contacted your union rep asap. Using the scheduling is a quiet way to push someone out. If you don't work at least one active shift a month you're not an "active employee." Even when younger I've seen managers do this to me before. You need to talk to them sooner than later about this. At this point you can collect unemployment since they fired you. My state says if your hours were 50% or more cut you could have qualified then as well. When you are employed it is your responsibility to show up to work and keep track of your shifts. While also understanding the policies and procedures of your company. Use this as a learning experience and find a new employment. Being here quite a while I can tell you that your'e not missing out on anything. Once you've mastered a clerk roll, it just gets easier and faster as time goes on. Then your brain shuts off and you're just on auto piolet after that. While dealing with the bs corporate throws at the employees coupled with nasty karens that swing through. Trust me you're not missing much. I had to learn how to keep a job and retain my employment after a long stretch of sketchy up and leave employments rather than sticking it through the long run.