I think you should get help from an Irish representative who is located in Poland.
I can tell you exactly what they will say: "Here is a list of local lawyers. Goodbye."
if i dont pay the maintenance - i could end up in prison - remember - we are all in europe now!
Call the Irish social security, tell them that you have reason to believe that the child is not yours. They will then stop paying her until she proves the child is yours (i.e. has a DNA test done). If she refuses to let a DNA test be done, you can use that to get a court order overturning the payment order because there is no proof the baby is yours.