Not pleasant at all I've made a late registration for my son everesince he was born he never had a birt certificate

Not pleasant at all I've made a late registration for my son everesince he was born he never had a birt certificate. Fine I know it's a late registration but what if my son gets really sick or could pass away I'm just making an eg not saying it's going to happen. It's been six months that I've been waiting for a phone call from them why is it that you need an interview to ask you if it's your child knowingly that I gave birth to him I saw him first I know him if it not all they will do an DNA test to verify if his mine I'm just so mad why are they doing this.