iPhone 5 rear camera not focusing

the camera on my iPhone 5 does not focus properly after a distence of 10 cm from the objec. I searched up the problem and tried tapping the lens, palming the phone and carefully hitting it, but it did not fix the problem. I tried a settings reset and that did not work either. If I need to repair the camera, how much will it cost in Canadian dollars. Also when I tap to focus, the camera makes a buzzing noise.