Contact customers, or a cross section of customers, some time after delivery and check that they are happy with what they bought and with your service to them. You can do this by email or by telephone. This gives you feedback on your operation and also gives you another legitimate chance to sell something. Your customer may have ordered one of something to try it out – if they are happy, you may get a larger order immediately. If they have any problems, apologise and deal with them.
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