My boss wants the HR to make 50% deductions off my salary because I don’t respond on sunday

While most of use have to work beyond our working hours from Monday to Saturday. My boss and some other colleagues expect people to work on Sundays as well.

Earlier I used to get a bunch of WhatsApp texts and phone calls on Sundays from my boss.

Since then I have done two things

1. I have and exclusive WhatsApp for my work

2. Exclusive workplace phone number

And I deactivate both from my settings once I leave my office on Saturday evening and don’t reactivate until it is Monday morning.

My boss and some of my colleagues have requested the HR and higher authorities to make 50% deductions on my salary because I am unreachable on Sundays.