I wouldn't hold your breath.
SEAT/VAG ain't gonna admit there's a
problem with the DSG, even if it turns out a high percentage suffer. They will just replace the gearbox - far cheaper than the bad press they would get if they admitted a
problem.
Have you made SEAT aware that you have contacted What Car?
Might be an idea to contact Which, the telly programme Watchdog and VOSA since there clearly is a safety issue here.