I read your answer on Tom Hoff's question, so I checked the Web for similar issues and all Samsung S380C users have the same problem. So why does the phone even have the option to set a ringtone but it has no use at all. Weird phone I must say. If you are able to, just get a new phone.
He's right. Take it back and get a different model. I'm taking mine back where I got it.. Not satisfied with mine at all. >:(