If it's bothering you that much, (and it certainly seems to be) just send them a short, polite note, thanking them for their business, and ask if it's possible for them to go back and leave you positive feedback if they were happy with the transaction.
Explain how it helps you do business in the future.
It's called 'follow-up'. Those of us in the exciting world of retail have to do it all the time, no matter how tedious, time consuming and frustrating it seems.
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Ain't much of a crime, whacking a surly bartender
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