Received a call from someone saying he is from singtel tech support, said his name is mark williams, has an indian accent. said that he can see malicious activities on my home and office wi-fi network and needed to know how many devices i have connected to the internet. i said i am not using singtel for internet, and he insisted that their unit oversees all internet providers and insisted on me sharing the number of devices I have connected to the internet. i hung up the phone after.