Despite not calling, the fact that the business owner himself ensured and gave a date and time of the bikes completion should have been enough. Thats was/is part of the local small town business ideals and I would trust what was said. So I don't feel the OP is at fault since the OP was not the one to generate the false completion date, not to mention the shop said they would call "if" there was problem in meeting that time frame. No call... should be no problem.
Now even though the shop erred, over the years I have since called ahead of time for just about everything even.... outside of cycling. Call them, see if its ready. If its not and they dropped the ball again, get the Cannondale.