When it happened to me, I twisted the axle with Knipex 86 03 180 pliers. One size replaces several spanners. By clamping flats tightly, they are less damaging than spanners.
That wasn't the problem. After several incidents in which I needed a 3-pound hammer and a block of wood to get the axle out and in on the drive side, I fixed the problem with a couple of strokes of a file.