@Rillowen, I had/ have the same issue with voles. I have tried various methods, and in the meantime, I have picked up a new hobby: collecting daffodil varieties
Voles and rodents avoid daffodils and their bulbs. So I have started planting daffodils in my garden and around some of my berry shrubs. They then avoid those areas.
Since daffodils are poisonous, I can’t plant them in the vegetable beds, but I use them to create borders. Since I didn’t want the same daffodils all the time, I now have a collection of about 60 different varieties. Garlic is supposed to work too, but I really can’t plant the whole garden with garlic.
Another method is to dig holes in the ground, line them thickly with walnut leaves, then fill the holes back up with soil and plant the plants there. My neighbor does that and it provides quite a good protection.