.........Take home lesson : change seat..........
Good job they didn't need your boarding card for verification !
Travelling after retirement I was once assigned something like seat 86Z, and jocularly remarked that I didn't know that the seat rows went back that far ! The female clerk sensed that I knew more than the average punter and started asking questions, which ended in a do-you-remember-so-and-so exchange of mutual friends within the airline from way back, that we had both known.
She then asked for my boarding card back and assigned me something like 20 A instead.
In the departure lounge a Mr. XXXX was paged, and told his seat had been changed - he got my 86 Z !!!
It isn't what you know ( or pay ), it's who you know. ( 'twas always thus )