I am totally familiar with this scam as I am an IT Manager. They actually called our company. They spoof a number which shows Birmingham MI. After their nonsense intro, I asked them for the name of the company, then their address. Told me Bloomington Hills MI. I asked him the street address, and he said, "why do you want to visit." I told him absolutely. He continued. I asked for the street address again. He again he asked why, do you want to visit. I told him indeed, along with the FBI. I then asked since he had such a thick Chinese accent, what city in China is he calling from. Don't let these people make you angry. Throw it right back at them.