Galway County Council

Under the FOI Act 2014 I am writing to request information that lead to my name being removed from the electoral register in G.C.C. I am requiring how information about how data is added to and removed from the electoral register. What is the exact system? Do data collectors knock at houses and ask who lives there? Did an error occur within this system to allow this to happen to me? How did it happen that I was removed from the electoral register with no communication from G.C.C? why is it that my brother who has been living in England for the last 5 years received a voting card and is on the electoral register and yet I have always been a resident in Ireland and was deleted from the system? Who deleted me?