Wow, that's a brutal work schedule. Hard to believe it's the norm. Isn't there enough demand that tech workers could elect to work elsewhere if their employer enforces this?
My life is not a way to transform calories into money for someone else, nobody's should be - stand up for your rights.
I worked seven days a week for two months. We were paid double salaries and some perks, but no amount of money would have convinced us to keep that schedule longer. It was absolutely crazy.
This is selective enforcement of law.
Triple hourly pro-rata pay is only for working over official statutory holidays, otherwise overtime pay is 1.5 pro-rata hourly rate for working days and double hourly rate for 'rest days' (this would include Saturday or Sunday for a Monday-Friday employment contract).