Punished by hours cut, any way to get back?

Hello,

Last week I had some teenagers steal my walkie and it was a huge big thing. I thought I would get fired but I ended up just getting a talk to. But now I see for next week I was scheduled for only 8 hours the week as cashier instead of on the floor. I asked my manager about it and he said that "Well you lost the walkie last week, cashiers dont need one!". Am I being punished for losing it (it was stolen) and how can I get back to my position? I dont wanna do cashier.