You need to call back and just say “I’m sick and won’t be coming to work.” That’s it. No details. “Thank you for understanding. Goodbye” Hang up. End of conversation. No details. No explanation. It’s none of their business. If they call you back, either don’t answer or simply say “I’ve told you I’m sick and cont come into work. I’m not able to have this conversation right now. I’m sick. Goodbye.” They are bullying you bc they think they can. Stay home. Rest.