I can`t recommend any specific operator, of course, if that`s what you expect. But it shouldn`t be a problem to google: mini koparka usługi and type the name of the place where you want to use it. Simple.
When we needed to have some earth works done around the house a few years ago, I used the phone number from a banner hanging next to a supermarket in the nearby town. And we didn`t regret coz the service was quick, efficient, affordable.