Law / Arabic guy - my wife left with my son away, she wants divorce. My rights to my son? Permanent residence card. [8]

Hello everybody,
i am an Arabic guy, i was married to a Polish woman since 2008 till now, i live in Krakow . we have a two years old son. my wife left me and took my son away to her city near Rzeszow two months ago. she wants to divorce.in this time i was trying to get the permanent residence card but they told me in the imigration office that i cant obtain it because we are not living as a married couples anymore.

my question is what is my rights as a forigen father to my son?
in which purpose i can apply for residence in poland ?
kind Regards!