I signed up with AGL short time ago. Today I got a call from the captioned number purporting to be from AGL. Not sure it is authentic AGL. I was asked to answer a couple of questions which AGL already had the answers. One of which was which gas provider I'm switching from. The other was whether I am moving home or switching. I refused to answer the questions, and the caller sheepishly hung up. Is that a real call from AGL? If not, how did the caller know I am switching/or have signed up to AGL? ...