Reality TV show host and politician Ksenia Sobchak is the face of Samsung in Russia, and is required by contract to use a Samsung smartphone. But the Mirror reports that she was seen on a television interview using an iPhone X.
She did her best to disguise the fact, using a piece of paper to try to hide the phone from view, but plenty of people noticed, soon promoting widespread discussion on social media.
AppleInsider speculates that the $1.6M Samsung is seeking from Sobchak may be substantially more than she was paid to endorse the brand, and cites several other examples of similar embarrassments. -9to5mac
Down below is another Brand Ambassador. They have many.