Won’t zero - read below - NcStar Tactical Red/Green/Blue Dot Sight w/ Cantilever Weaver Mount

I like this optic in general. It has three colors with three levels of brightness, all easily selected from a single knob. The 35mm size makes it easy to acquire the target. The problem is that I cannot adjust it far enough to the left to zero it (like some of the other reviewers here.) However, I noticed that I could adjust it very far to the right, so on a hunch I flipped the scope in its mount and then flipped the mount on my rail, and I then had enough movement to zero it. This makes me believe that the cantilever mount is off (the saddle at the top being off-axis with the rail-mount at the bottom.) So far, Nc Star has not been helpful about this. The rep I spoke with suggested that if my solution fixed it then the problem is solved, but to me it’s not. The mount is off, and I’d rather have it replaced so I can mount it the right way, and fully trust my sight.