Replying to Getting called in to work...

does this shit happen to anyone else? like i'm scheduled to work usually 3ish days a week but end up working or being able to work 5 days a week. it's fucking annoying cause i have other plans but my mom is a bitch and answers the phone and tells them i'm available when they ask and it pisses me off. fucking fuck i had things to do tonight but scratch that now. i'm just telling them i can't come in anymore. i have my week planned around work and when i get called in everything gets fucked up.