The scammer with an Indian accent called to my landline saying they are a technician team calling from SingTel.
They mentioned there might be some problems with my internet. They asked for some of my information like what device am I using, how many person in my household, how many lights are blinking on my router. 

After which, they told me to go to my computer and activate the command prompt.
I told them I would contact SingTel directly to check and they hung up immediately.