getting weird messages from sprint HELP!

[shanryx2]

I have been receiving this weird message over 200 plus times. I have no clue what it means and neither does anyone else. It keeps telling me that //ANDROID: $(from) has sent you a Sprint Voice Message. Call $(callbackno) to listen. CFGs1840.0=10bc1e45d68ecf7aa661Q6rB8eb8//CM

I must get this message about 20 times a day! The only thing that varies between them are the numbers and letters. I don't know what this means or what I'm suppose to do. Can anyone tell me so I can make it stop!

Thank you
Karen