Sight is good, but their customer service is not - Meprolight MPO Pro-S Closed Emitter 3 MOA Dot Pistol Sight with RMSc/JPoint Footprint

Sight developed a small chip in lower front edge of glass, maybe a shell ejection or something else. No damage to the aluminum housing and no marks around the chip. Sight has not been abused. The sight still works, but condensation gets into middle of the sight.
I used the Email portal for Mepro , no response. Called 2x no response.
As of now Customer service sux. we shall see, been 7 days.
Parallax is less of a problem than w my Holosun eps Carry. i like the sight, but Cusomer Service is MIA.
The Mepro open emitter is good on my other pistol. no complaints.