The scammer called impersonating Singtel.
Supposedly my internet connection and router were having issues.

I immediately found it suspicious that someone from Singtel would call me about that since I'm a viewqwest subscriber. Also, the sound quality of his phone line was really bad, and the scammer did try to give me a lot of technical details that felt quite bullshit. I started to laugh, smelling the scam and the scammer got pissed asked me if I though it was joke. I talk him I'm amused and I'm waiting for him to ask me a password or a remote access. then he hang up before I did!!