Common small business mistakes have become a regular series here. Today, a couple of examples of blaming the customer.I called the local paper to have an ad pulled. The gal said OK. But it ran again the next day. I called back. The response was, "You didn't call soon enough yesterday." But I knew that she was wrong. I tried to get my liquor sales rep to help me arrange an extra delivery for an item I didn't receive. He said to me, "It's your own fault not getting it ordered correctly." And I...