Big problem need help [illustrator]

Hi guyz,

I have an adobe illustrator file with an artwork with about 30 levels…i want to flatten them all…but flatten them really…

If I use the “flatten artwork” option in layers palette…it flat them but not rally…

I need to have “one” layer with no possibility of selecting the various lines that compose my artwork…

I need to give this file to a client but i don’t want that he can change the colors of the single elements that comose my artwork…

So i need to flatten all layers, but it must remain vector…how can i do?please help