Finally sorted. It took an hour and 20 minutes this morning, an hour and 15 minutes on Wednesday on the phone and 3 emails, to get a ticket for the South Stand via my flexi membership. It should take 2 or 3 clicks of a mouse.
The lady I spoke to today was far more helpful than Wednesday but did again try and get me off the phone by saying Ticketmaster were coming in this Afternoon and would sort it. That is what I got told on Wednesday (but that they were in Yesterday), so I pointed that out. When I did, she spoke to another member of staff who manged to sort it in a couple of minutes. They had the seat I purchased showing as a totally different person and as a season ticket seat, so there are some major flaws somewhere impacting them.