Ps. That was after i received same answering machine message as you. I called back. But since i has only a partial message i had no case# etc. smells like a scam.
I have been receiving calls from this number for about a month first time, they called and left messages. After hearing the messages i got worried and called the other number they gave me to call. Called number and they said it wasnt me and took my number off the list. A couple weeks later they are calling again leaving no messages now. I do not know what to do. I know that i dont own any money or getting sued but the calls really bother me.