I purchased a computer for resale on June 23rd 201...

I purchased a computer for resale on June 23rd 2017 (a Friday) and delivered it to my customer on June 27th. It came back to me on June 21st 2018 (a Thursday) with what appears to be a hardware issue. I contacted them on June 27th and they refused to cover it stating that it was paty warranty. Since I bought it on a Friday I wouldn't have received it until at least Monday (the 26th). The computer in fact has a dead mother board. Vary disappointed with their decision. The sales person didn't even bother contacting me after the decision.
Update July 6th. After contacting BBB they have agreed to repair the computer. Let's see what happens.