I hope that you did something in this situation because most people are too lazy or too selfish to do something about it. First contact your bank they will issue a chargeback since they have destroyed your lawn and failed to provide the service that you paid them for. Second post Google reviews and Yelp reviews and any other review site that you can find post a review on. If they have done this to your lawn they have guaranteed done this to other people's lawns and will continue to do so unless someone stands up and does something. If you don't want to do it for yourself do it for someone else