When I first called the power company I got an engineer that wasn't RF savvy too. In my case, and it sounds like yours too, if there is no longer a dedicated RFI guy and just any available engineer gets assigned to it. These guys are usually designing and troubleshooting power distribution systems and not familiar with RFI.
The first engineer showed up and found some noise sources, and dispatched crews to repair it, just like yours. They did this several times and repaired a lot of stuff, and it took a while to actually get to the things that were RFI to me.
Then they took a class on RFI, got new equipment, and really started getting rid of my noise. About that time the first engineer got reassigned and I got a new engineer that had taken the class. He was great to work with. I had his cell number and if I heard a constant noise he would swing by to check it out that day or the next.
Now I'm on my third engineer. Almost as helpful as the previous ones, I've been lucky. They connect to my antennas now and go for the kill instead of randomly fixing noises like they did at first.
The second engineer showed me a few tricks too. Just stand with your back to a suspected pole and give it a mule kick with one foot. You don't need to move the pole a lot with a sledge hammer, just the slightest shock to the pole will cause the noise to change and you've found your pole. It really does work, I've seen it and done it, and I was trained by my power company.
That said, the safety warnings mentioned in this thread are a valid concern, don't mess with that stuff.