More than insufficient service in the air and on t...

More than insufficient service in the air and on the ground!
In a row of three, a man who was so overweight was sitting to my left, which is why I couldn't sleep for the entire 7-hour flight. Although I told a flight attendant that the man was using half of my own seat, she was supposedly unable to give me an alternative seat due to the high occupancy of the aircraft. Following my complaint, I was informed over the phone that British Airways was not suitable for overweight people and that I would have to buy a more expensive seat next time so that I would not have such inconvenience again.
This can only be topped with the fact that the employee could not explain herself, which is why I was not given an alternative place, because there would still have been 3 free places !!!! And still not a trace of courtesy or compensation! Incomprehensible! What a bad service in the air and on the ground !!!!