I have also encountered this problem. Because I was once angry, I violently opened the door to my room with such force that I tore down the carpet. I then could not control myself because I was very emotional from that moment. The next day, when I cooled down, I saw what I had done and decided to give the carpet to the guys from the carpet repair service, as the carpet was quite badly damaged. It was about 10 inches, I don't think I could have fixed it myself, considering I don't have the right tools. I hope these guys will help you too, because in the end they did their job perfectly.