The Weirding Ways

Alright, I picked up Monty from the vet (The poor cat is wobbling around from the drugs), got home, I get a phone call, figure it's my mom calling to see how he is.

No, it's some girl, on a very bad cell phone connection.
Says her name is Jessica... something, I couldn't hear the back end because the connection was so bad. The conversation goes something along the lines of this:

Me: Hello
"Jessica": Hi, is this Angus?
Me: That'd be me.
J: How's it going?
M: Uh... Just fine, who is this?
J: Jessica!
M: Jessica.... who?
J: Jessica
M: I'm sorry?
J: Jessica , You gave me your number!
M: I did?
J: Yah, at the mall, don't you remember?
M: No, I don't. Which mall was this?
J: Promenade
M: Ok..... How long ago did I do this?
J: Like half a year ago
M: Sorry, I just got home, and my cat is wobbling around, just got back from the vet.
J: Your cat? Do you have a girlfriend? Cause you said you have a cat. I have a dog.
M: Right...

M: Look, My cat is falling over, can you call back later?
J: Yeah alright, bye
M: Bye


Throughout all of this, I hear laughing, or some kind of static or something in the background. That was one weirdass call. I barely go to promenade, and I have no recollection of ever giving my number to any random girl.

The vote: Prank call.

But why? And why at my Home number, where I spend little time and am frequently ... moved away from. Like I would have been half a year ago.
Weird.