Had a similar experience. Was at a party when I suddenly received a notification from our country's equivalent to cashapp/Venmo. It was about $450, so not a lot but enough to be significant to many people. About a minute later I get a call from a seemingly young man who's very stressed telling me he sent the money to the wrong number and asking me to send it back. I told him don't worry I'll get your money back but I need to contact customer service first just to make sure it's safe for me to do so. I wanted to avoid some kind of charge back scam or similar.

So I called CS, they said it was safe to return the money and so I did and the guy called back just to thank me.