I’m no lawyer so comments re “terms and conditions “ I’ll leave others, I think your complaint is reasonable, it cannot be difficult for an administration such as Edinburgh Rugby to allocate seats in a similar pattern to that in use at Myreside, stewards seem to be around at the start and end of the game so that shouldn’t be a problem either, I of course assume that ER could run a TonySpreadbury up in brewery.
Good luck with your problem and keep us informed.