Hold on a minute here; they didn't make you do anything. You elected to send a rifle back to them for what you determined to be unacceptable accuracy, which in and of itself is a highly variable and largely subjective characteristic, especially given that few shooters are MOA. Furthermore, you tell us in your other thread that your (over max) loads produced .5 MOA groups.
I absolutely wouldn't take it on someone's word that the rifle I built for them didn't shoot to expectation. I'd tell them to bring it back to me with the ammo they'd been using, and then I'd go test it with that and with premium factory fodder, make my own determination under conditions that I control.
I own a lot of Remingtons, and while none of mine have ever been problematic, I've dealt with Remington on other peoples' behalf. That is not typical of their CS, which leads me to question how you are handling the matter. No company is going to be inclined to help you if you're hostile, aggressive and demanding with threats of never buying their products and lambasting them online. Maybe you haven't been, I don't know. But as a business owner and manufacturer who will bend over backwards and go way above & beyond for people who are respectful, the way they're handling you is exactly how I'd deal with someone who was accusatory and importunate. For example, on the auto repair side, I'd occasionally get a customer who'd come back a short while after repairs screaming and hollering about how they just paid so many dollars to get this and that repaired, and now the check engine light is back on and I'd better fix it right effin' now. Low and behold, a new code for an unrelated problem, so you can bet they were charged every red cent for diagnostics, parts and labor, and I would be in no rush to fix it. If that person had just showed respect and humility, they'd have got the diag for free and probably a pretty good break on labor to fix the new issue. Again, don't know how you've been with them, just putting out there that, as frustrating as it is to get a product that doesn't perform, we still need to temper ourselves in trying to get the issue resolved. Hostility and threats are a last resort.