title: is this an attempt to scam me with my app published in Playstore?
body: <p>I have published a free app in Google Playstore (and some other free distribution stores), it only contains ads, but it is completely free and does not require any kind of subscription to be used.</p>
  <p>Recently, I have been receiving several emails from supposed users (with different usernames) saying that they want to cancel their subscription to my app and they want refunds because the subscription took money from them.</p>
  <p>Is this a kind of scam? my app is completely free!
  Is there any possibility someone has stolen my app code and has put a script to automatically subscribe users and take money from them? (my github repository is private)
  Could this be happening because I published my app on some other free distribution stores (like the Galaxy store)?</p>
  <p>What should I do?
  Thanks.</p>