I purchased a math book from NEST in May 2021 and when it did not show up I sent multiple emails and searched for a phone number but could not find one. Just last month(Feb 2023) I received an email saying that they have been having trouble with receiving emails and calls without realizing it and asked if I would like a refund or replacement order. I was skeptical since so much time had elapsed, but I requested for the original order and a phone number to reach them. Within two weeks that order arrived from one of their competitors sites as well as an email from Nest apologizing for the confusion and a phone number to reach them. Here it is: *******298. They made things right. I was impressed.