Sticky strips,work a treat on other rodents,if they want your figs and have to cross a white piece of paper to get to it they will...try.Only problem is you then have to 'deal with them'.,at least with poison they usually just hide somewhere and die.
You could try borrowing a cat,get someone who owns a good mouser to bring it over,Voles are dumb,90% of what the family cats caught when I was growing up were voles,that's despite living next to a far(rats),in shooting country(pheasants),in the countryside(mice,birds etc-the cats basically had their pick).
If you really can't even go near a cat you could get a hawk or a snake,snake might work well,make a nice bed for him with your figs and it will be like an all he can eat buffet