Poor heel construction - Propper Mens Series 100 8in Military Boot

Poor heel construction; between the heel inner and outer lining there is a support made of plastic. When I purchased originally, summer 2018, within a month the support broke into pieces upon itself rubbing into my ankle. Propper sent me a new pair of boots an I sent the faulty ones back for review. Within 3 months of total wear over the course of a year ( I am a Reservist so only wear on drills and ANNU training, they fell apart again. I have a shoemaker removing the ankle pieces and sewing a piece of leather on the inside. Propper wants me to send original receipt, which I will do. Requested upgrade to better boot, if they have one with no heel plastic and I would pay difference. Still working this out.