Confuse :Of and For which one is better

[hello12345]

I am always confused for using "For" or "OF" ,like below

This error undermine satisfaction of cusotmer to us

This error undermine satisfaction for cusotmer to us

which is better and why

Thanks

[bhaisahab]

I am always confused for using "For" or "OF" ,like below

This error undermine satisfaction of cusotmer to us

This error undermine satisfaction for cusotmer to us

which is better and why

Thanks

Neither of them is very good. Try, 'This error undermines customer satifaction with us.'