Won't hold zero if its life depended on it - Pulsar Trail 1.6-12.8x42 LRF XP50 Thermal Rifle Scope

I did a lot of research before buying this extremely expensive piece of equipment for hog hunting at night and was so excited to recieve it. I went to the range to zero it (used hand warmers taped to the target) and it was quick and easy. So....in two weeks went hunting with a buddy. We set up in a field that was been taking hog damage over the past month, wait out for a group of 12 hogs to come in 100-150 yards and start shooting! I don't think I hit even one hog. Buddy took the ones on the left and got 4 of them. I took the ones on the right and they all left without any holes. Didn't hit anything that night. When I went back to the range to see what's what I could not hit paper at 100 yards, which is my zero.