Nest finally sent out a guy to pick the mattress up, but after going over it with a Maglite he declared that the side that was touching the bed frame was dirty, and thus the mattress was unreturnable. Complete scam. I eventually wound up paying someone else to take it to a charity, and the charity had no problem with it.
In comparison, my return with Purple was easy and hassle-free. I didn’t like their product, but at least I have faith in the company.