Car repainting rock chips insurance and bad paint job I need help!?

I was in an automobile accident where my car's bumper was replaced and painted. Now 6 months later the paint is chipping, bubbling and peeling. However I have moved 2000 miles away since then and the place I was sent to by the insurance company isnt a chain but an independant business. As well the insurance claim is closed. What is the best cheapest and easiest way to get my car back to normal. Thanks