Is customer always right?

How do you think about that? I dealt with one of our customers about the invoice printing problem (Yes, I am a programmer). She kept saying some customers are not printed when she printed the invoices. She said all customers were supposed to be in one printing batch. I got her real data to dig out what's going on and test. Come on, the data show there are two batches on the same day and they were not supposed to be printed together, but they will all be printed. However, she didn't believe it. She said she printed those customers in one batch. I don't know what's going on on that day in ther office. But I am sure data is good and codes are good too. I even undo all batches and reprint the invoices again. All are good and printed. But she somehow got pissed. So is customer always right? Hmm... I doubt it...

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