I'm very confused as to what the Battle.net program is even doing

First off, the sound for the game Hearthstone was not working for me for several days, so I tried uninstalling all of Battle . net in hopes that it would work again. However, it seems I can’t get Battle . net now, and despite the fact that I literally uninstalled it and it’s not anywhere to be found in my files, it still appears in “Apps” and it tells me I have not uninstalled it. When I try to download it again and run the installer, it doesn’t do anything. What can I do about this?