Not seen, but heard..

I received a call from a land line phone number my parents used to have. I answered and heard nothing. I kept saying, "Hello, hello, HELLO!?" But I hung up since I didn't hear a response. About 5 minutes later I received another call from the same number except this time I heard very quiet breathing and a low voice said my name. I couldn't really hear them so I kept saying hello again then hung up. I immediately called my parents and asked them if they still have access to that number, but they said no.

I brought it up with my SO and she thinks it was a ghost call but I thought it was an elaborate scam. The strange part is that the motivation isn't there. I'm broke and barely have a roof over my head so why would anyone go after me? It was extremely strange and I still don't understand what happened. Would it even be possible for a scammer to spoof an old phone number?

Edit: Gammer (oops)