A fussy but effective method that I've used:- Drill two 6-8mm opposing holes in the hexagonal rim of your 'removal tool' and bash it back on to the filter. Next, get a pointy screwdriver thing and bash two holes in the filter through the holes in the removal tool, a sharp tap with a hammer does it. Next, the clever bit, screw two short fat wood screws through the holes, I used a couple that I found at the bottom of my cabinet, I'm sorry I don't know the sizes, obviously make sure the screwheads are grubbed up against the removal tools rim. Re-insert driver and lean on that breaker bar.
If that doesn't work for you and the filter seems to be just twisting and mangling up, use the screwdriver method.