The GF and I were flying LH447 and upgrades to upper deck F seats last minute at the gate. Got seated and the FA asked us why we were sitting there. She wasn't happy with us up there. Later on the purser asked what we were doing. Mind you the GA escorted us on and let the crew know we were upstairs. The purser was pissed and said we didn't belong there mad our flight very awkward. I asked if she resolved it an hour later she said no. She told us that someone took our seats downstairs and we might have to be reaccomodated. We kept our seats. Our service was not by any means nice. All the other pax were treated with regard. We were not treated well at all. We dressed we'll have high end luggage etc. it's not like we looked like bums or anything. We wanted to get off the plane , but it was too late. I know LH could care less. It's just a shame to think that we bothe agreed that United would have been better than LH. I'm just glad I dumped my LH miles last year.