Z endstop not stoppping

[Metushelah]

Alright guys,
its my first time I'm building a 3d printer, the thing is its my cousin's printer so I didn't build it mechanicly, it just sat in his house for 2 years so he gave it to me to finish it up.
I connected everything and im running over the manual and I'm stuck with the Z end stop.
When I use the home button for X and Y axis they go thier place and I can see Triggered on both when I write M119, on my Z endstop when I click home it goes down all the way to the endstop and trying to continue to go down like its not sensing the endstop, and even tough it touches the endstop I write the M119 command and it says open.
I replaced the Z endstop with my X endstop that I know its working and when I replaced it I did get a trigger with my (former z endstop) "new" X endstop, so the endstop is okay.
I tried many combinations in the code to invert Z min or max and I didn't manage to solve the problem.
Thank you.
Any information that you need just tell me and i'll upload as soon as I can.