If you and your son's father were never married, then you have sole legal and physical custody. You do not have to let them see or speak to your son at all.  In order for the son's father to have any visitation or custodial rights, he would first have to "legitimate" your son in the Superior Court.  Accordingly, I will assume that he has not filed a petition for legitimation.  Thus, you can (if you so desire) tell him not to call you or come to your residence or place of business.  If you feel he is stalking or harrassing you, you can obtain a TPO (Temporary Protective Order).  However, he is reqiured to pay child support.  So, you should either contact child support enforcement or retain the services of an attorney to pursue child support.  Child support is completely separate and unrelated to visitation/custody.