20 amp fuse instead of a 15 amp fuse

Have you ever seen a car with the interior on fire. It’s something to see and feel from a great distance. Don’t park this car anywhere near your house, any other house or building, any other car, or anything else. It would also be best if you didn’t drive it.

I’d remove the fuse, fix the problem, and put a 15A fuse back in, in that order.