Thanks, over9five, that's an especially memorable story for me. I could tell many similar ones about consignees who call complaining that there is a problem with their UPS shipment, that they'll never use UPS again, that they plan to sue UPS and put UPS out of business, etc., then, when asked for the tracking number, they give a USPS tracking number.
It's a real pleasure to ask: "Does the label say UPS or USPS", knowing the answer before I ask the question. Then I apologize for being unable to assist them with information on a another carrier's shipment, thank them for calling UPS and ask them to call again any time we can be of service.
Something that strikes me as positive about these calls is that the callers are apparently automatically thinking "UPS" when they think of "package delivery". If they are unhappy with service provided by the "other guys", being treated courteously when they call UPS in error seems to put a whole new light on UPS in the caller's mind. If calls like that are handled well, then, ideally, the caller will want to have their packages shipped via UPS in the future.
Incidentally, UPS customer service representatives are instructed to NEVER speak negatively of other package carriers as it is against UPS policy. Instead, we are taught to treat it as an opportunity to talk positively about UPS service, rather than to agree or disagree with the other person's complaints about the other carrier.
Never "badmouthing the competition" is one of the many ways in which the corporate integrity of UPS is reflected in the manner in which UPS customer service reps. are trained to handle calls.