Today i was heading to work and got to the garage i park at and at the entrance there were utility trucks that were there helping with some pipes or something. anyway they had the entrance pretty well blocked off and had to try and guide me in between two of the trucks to get into the entrance. The problem is they didn't quite guide me too well and my right front fender clipped the corner of the steel bumper of the truck and put a huge scratch and dent all the way to the wheel well. (the scratch is like 3.5 inches long). Anyway i wasn't sure at the time if i had a right to complain so i just went ahead and went up to my space and parked. My question is is it my fault since i essentially hit a parked car, or theirs since they were guiding me? Any opinions on what i ought to do?