My company has decided we have to work Sundays until the end of the year, making our work week six days. This is mandatory. At first it was optional. With two days notice they changed thier minds

I applied and accepted the job because it is M-F, no evenings. HR guaranteed this at my interview. Weekends are time to reset and rest. I'm not giving that up, even with over time pay.

I do not have enough time to call out every Sunday. That would look suspicious anyway. What can I do?

This company lied to me. Until I find other work, which probably won't be until after December, I can't quit