Fixing tires?

Hello, I parked at a construction site last night, then drove to work this morning and parked the car in the company parking lot. Then wanted to drive back home this afternoon, but was not since I had to change the left rear wheel first. There had been a splint-like pen drilled into my tire and flattened it. Here now my question: Can you fix a tire in size 205/55 R16 91V or do I have to replace it? Did the tires before two weeks ago new bought and not even 1000KM with completed. Thanks already in advance to all the answers.