There has to be a boss who is more responsible than the crew members. Have you seen anyone stopping by to check in on them. Perhaps that is who you should talk with.

I had an issue with some of the work the county did in front of our house. I asked a few of the guys who couldn't understand English and they shrugged at me with smiles (that helps). Then I said, "boss?" and they pointed to a man up the street. He was most helpful and instructed the crew to make the change I suggested.

Good luck.