Wendy’s

I worked Friday with no issues then asked for the schedule today for the week. I’m not even on it but no one called me since Friday with any issue etc I called and talked to my manager and he said HR said I can’t be put on the schedule right now for something but he claimed he was unsure why. I’m a single mom of 3 and I can’t have hours played with. And for no call since work Friday and to call and randomly find out I’m not on the schedule?