Nightmares
I was kind of on the other end of this. Used to get really angry (American) people phoning the help desk for a company I worked for. Couldn't work out what the fuck they were banging on about. Turned out that some American state automated toll system was called the same name as the global internet roaming company I worked for.
Sadly, rebooting Windows XP computer didn't solve their issues with some fucking toll bridge in Iowa or whatever. Other American places starting with "I" exist.