Bad service and no communication

Someone opened a Game account using my details. I went to a Game close to me to lay a complaint. I was advised that I need to fill in forms and send the to their offices. I was told the investigation will take 21 days. I called after 21 day to find out how the invitigation was going. I was told to resend the forms again. 21 later again still no response from Game Store. This has affected my credit score. No one from Game has contact me. it's clear that a person can go and open an account using g **** documents and approve. I'm so disappointed with there service. I was not expecting such service from Game.