They called me but I didn't answer as my phone said potential spam. Called them back and heard VMS, "The mobile no. that you have called is switched off. Please try again later."
Prefix (02) a mobile no.? I'm even more suspicious of it being scammer.

I usually answer before I block people. So I answered this call and said hello about 3x. Voice on other end said by. That was pretty much the whole interaction.