I had an issue were my comtacs continuously ate batteries, even while off, a new set would last a few days. I reached out and the first person told me the only way to service them was through the retailer I bought them from, which was impossible through the distributor I got them from then I finally got a guy over there that set me up with a return.
They made me pay for the repairs, which was not cheap and after a lengthy phone conversation in which I learned more than enough about peltor/3M, I ate the repair, got them back and sold them. I got a set of AMPs and are very pleased with them.