Nowadays, whenever I receive a call from a number I don't know, I let it go to voicemail....and if they don't leave a message, I blacklist it!

a phone call from unknown number, no message left via sms or voice mail, most likely a spammer/ junk call

Randomly called and said they were from some ceiling upgrade thing

Called and asked for Michael Baker. I am not this person but I know from past experience that anyone asking for Michael Baker, is working off a spam list that my number somehow ended up on, under that name. So definitely spam.

No message left.

Didn’t answer and they didn’t leave a message