That really sucks. I don't understand why managers can't wrap their head the idea of call outs. They never plan ahead or have contingency plans and suddenly the employee is the "bad guy" when they happen. I've heard managers talk major shit on people that called out, and I'm talking people that rarely call out and are doing so for legitimate reasons.
While we are on the subject of employers trying to force you to work, I wanted to vent something that pissed me off big time back in February:
After 9 years of working with the company of my last job, my store manager tried to fire me on my last day.
Long story short is that I was applying for a hospital job for months, which my department manger was fully aware of and even gave me his blessing. Everything was kosher until I finally gave my two weeks notice and then I became the "bad guy", "turning my back on the company", so my department manger whined to the store manager who made it worse. Ultimately they apparently thought it would be funny to put me on the schedule on same day that I was starting my new job, and I made it very clear that I wouldn't be there, that I would be working at the new job.
Then on my last night, the store manager gets in my face and says he's firing me for "planning" to no show the next day. Without saying anything, I went right the shop steward, who called the Union Rep for our district and a lot of shit went down. At the end of the day, I won and was able leave on "good terms", and get paid out my vacation time, but it was probably one of the most infuriating nights of my life.
Just another shitty manager in a long line of shitty manager's I've dealt with over the years, but I've learned to really cover my ass and anticipate worst case scenarios.