Logitech H760 - painful as it gets ..

I bought the Logitech Headset H760 3 weeks ago. And it's incredible, what a miserable quality of the headset. After only 10 days the headset broke on the width adjustment. OK, I found the headset always great (I like neckband headsets) to Saturn and since Friday I have a new H760. What happened? After only 2 days broken, of course, on the width adjustment! And, although I have in any case already with Glace gloves as a gold ring, attacked. Reads Logitech actually reports the buyer at Amazon.com? Out of 16 reviews 8 buyers exactly happened this fate. Refracted on the width adjustment. Embarrassing as it gets. Cheapest plastic. And with Logitech, a world-leader. Embarrassing it is really no longer. How can such a thing happen? No subjects at Logitech product a practical test before going into production? I had a good mind, Logitech tilt this scrap before the company door. Something like this is really a joke !!!