Don't bother with above, if you got the registration number, call the FAA and register a complaint, flying too low.
Once, well maybe more than once, went flying with an old gentleman I met at the City skeet range. Asked me if I liked to fly, which was a really ignorant question. Said he would call me some time. And he did several days later. We took off in his Cessna tail dragger. Ask me where I wanted to go. As his guest, I said anywhere. He said how about we fly down the barge channel. Fine I replied. The next thing I knew is the top of the channel berm was above the wings. For those unknowledged, a Cessna wings are on top of the body and the channel berm was above. Downstream, I knew, there were power lines and a lock & Dam. I really was afraid he was going under the lines. But several hundred yards from the lines and the lock & dam he pulled over them. Said couple years aago the lock master reported him to the /FAA and they pulled his license for 90 days. I flew with him many times after that. He was an excellent shotgunner, breaking 25 more than once, many times. He has passed on and maybe flies now without a noisy engine. Hopefully.