Admin mistake makes me look bad

I posted my shift for today almost 2 weeks ago and someone took it. It disappeared from my schedule. Today I get a call and a nasty voicemail from the ASM that I am on the schedule today and need to get to work and that I’m posting to many shifts which is causing an issue because people don’t want to work on weekends. Umm what??? I always get my posted shifts covered or I come to work. Turns out our admin took it off my schedule but forgot to switch it to the person who took it who by the way showed up for work. I’ve been at Kohl’s for 8 years and being treated like a child and yelled at in a voicemail is my breaking point. I spoke to the manager when I posted the shifts because I was questioned about it from the start. It was a personal family matter I had to leave town for. Also I’m only a few days a week and have a full time day job. I did call and speak to the ASM and told him what I saw on my app. He still said it was my fault. I give up!!