Changing Business Card Designs

I have to call my printing supplier to confirm boss's business cards designs again. This was the fourth time my boss changed the designs. I'm quite embarrasing to call the supplier, but I can't tell my boss that "Are you trying to making trouble for the supplier?" ha-ha...So I had better call the supplier now and request them to change the artwork as soon as possible. Else, they might not able to deliver the business card on coming Tuesday, which we need get ready for a presentation.