I keep getting someone else's calls. She seems to have a lot of problems in her life- should I do anything?

I think somehow this girl named Amanda had my cell phone number before I did. I’ve had this number for over a year, but I get calls from her friends and family asking where she has been all this time and updating her on news in their personal lives. (I mostly don’t answer strange numbers, so this is in the form of voicemail.)

Some of these calls sound reproachful, and these people imply that they haven’t seen Amanda in a long time, but I get maybe at least one call like this every two weeks. She’s also being pursued by collection agents. The collection agents will call once a day or more for several weeks and then lay off. This has happened about three or four times. I’ve told them that I’m not Amanda and they need to stop calling, and their reaction was basically, “Yeah right. Pay up now.”

I’m getting kind of intrigued/ worried for this woman, and I wonder why people like her immediate family call my number looking for her. Sometimes I answer by accident and let the person know that they have the wrong number, but I get a lot of calls for her. Next time someone calls, should I tell them I think Amanda is in trouble? It’s probably totally intrusive coming from a complete stranger. Also, how do you convince a collection agency to stop calling? I don’t want to change phone numbers because now all my friends and family have this number.