Turns out she dialed a wrong number and got someone with the same family name.
That reminds me.
The other day the phone rings and my SIL answers it. I had gotten up to answer it, but she said, "No, no, it's always for me, I'll get it!" Then I hear:
SIL: Hello, (Sil's name) speaking.... Oh. Oh! Yes, she's here.
She gives me the phone with a big smile.
SIL: It's for you.
Caller: Hello, this is Isabel (common Afrikaans name, not Twilight-related). Are you T'Mar?
Caller: Is your husband at home.
Me: Uh... I don't have a husband.
Caller: But you're T'Mar?
Caller: What's your surname?
Caller: But I'm looking for (first name of man) and he said this was his landline. Is your number 011-123-4567?
Me: Yes, but I'm not married.
Caller: But his wife's name is T'Mar.
Me: That's very weird, but I assure you, it must just be a coincidence.
Caller: Oh, sorry to bother you then.
Me: No problem.
Caller: I'll try his cell. He wasn't answering it.
Me: Okay, bye.
Caller: Thanks again, bye.
So she called the number he gave her as his landline (we've had this line since 1977!) and his wife and I just happened to have the same first name. A few years back there was a scam where foreigners would arrange paperwork to show they married South African nationals, but I checked the citizens' database and I'm shown as single, otherwise I'd be worried.
Still... very weird.