I recived a text to call (02) 9037 8466 within a minute i rcd a call from same number asking me to ring back on the same number and told me that my friend is waiting for me! I rang back, just to try...but just heard some voice prompt!does any one know what this is about?

I recived a text to call (02) 9037 8466 within a minute i rcd a call from same number asking me to ring back on the same number and told me that my friend is waiting for me! I rang back, just to try...but just heard some voice prompt!
does any one know what this is about?