Worse service ever

My Audi went in for globe replacement of both front lights on Friday. We had a huge downpour on Friday evening and I used the car at that time. For the first time ever rain was pouring into the vehicle at both the driver’s and passenger sides. Obviously a part was not placed back properly or probably not even placed back at all. On contacting the owner and the mechanic on Monday morning they were both very aggressive, had no interest in resolving the issue and told me to take my issue up with head office. They obviously knew how difficult it is to get hold of the head office. It is totally up to anyone to choose whom they use for services, I urge you to make a better and more informed decision than I did