Good to hear you had a decent service. You may not get it back but by reporting it you have flagged up that their is a problem. Unless the Police know about this there won't be any pressure to have patrols in the areas where it is happening. It is only through increasing patrols and stopping any dodgy looking cars that they stand any hope of catching these low lives. What goes around comes around and eventually they will be caught. Just be careful about confronting any of these criminals because they could react violently.