FireVault won't stop encrypting my new MacBook
I bought a 13-inch MacBook Air yesterday and I accidentally turned on FileVault encryption while setting up the computer. I didn't know what it was. My bad.
FileVault is stuck at 17% and there's no way I can stop it. It says it's going to take several days to complete.
My Mac is brand new so there's no way there's enough data for FireVault to take that long.
I urgently need a solution so that it lets me install Mac OS Mojave because I'm having problems with iMessage and FaceTime on High Sierra.
By the way, the closest Apple Store is more than 50km away from me so getting a Genius appointment which may cost me money is not a valid solution for me, sorry.
I bought this MacBook yesterday and I'm really upset so far.
MacBook Air, macOS High Sierra (10.13.6)