Pfft, your kidding me right? Yeah you should say something. If you were late for class or missed a day of work, do you think they would just say "Ah, this is normal here, just let it go". Hell no, they'd be at your place in a jiffy banging on the door, wanting to know hat the hell had happened to you.

You don't let such things go, even for a day. This tells them you've got a door mat mentality, and that in the future they can screw you over even more. Don't be lulled by the crap way Chinese often do business here. Demand your salary on time, and make a fuss. If you don't, your a fool waiting to be clipped, and they will take advantage, trust me.