Is it not worth buying the car, fixing and then selling it privately to try and recover some of the losses? I guess there would be an issue that the first time SEAT saw the car come back in they would show the new owner the 2 fingers too.
It seems 'interesting' that they've chosen to offer you just over 50% of the orignial selling price of the car back, almost as if this covers a legal loophole for them (eg. if you'd paid and owed less than 50% this would be much harder for them to conduct). They have offered you the minimum they can get away with which is pretty rude.
One question, do you have GAP insurance with the car. Does that offer you any scope for recouperation?
If this had happened to me, I'd never buy another VAG car. Whilst I believe that rules are there to be 'noted', these days they are so extensive and all encompassing that it's a miracle they allow you to break wind on the seat of a car which is being financed.
I long for a day where a paying customer can have an intelligent and constructive chat with
dealers/SEAT UK about issues like this. You could argue when we put on a Forge DV it is ONLY to mask the inadequecies of their flawed and regularly revised product. Your exhaust is better than OE. Your FMIC is better than OE. Neither effectlvely change the core engine parameters. Although the remap does, it's hardly evasive surgery. We are just expoiting the weaker point of their already fragile product (the S3 is just as bad and suffers similarly with fueling / misfire / electrical issues). We could all work together for the greater good, helping them to build a 'known issues list' of
dealer fixed faults, or we could all walk round blind with our heads up our ars£s driving Ecomotions which will still fail but because you've got a Richbrook tax disc holder your voided your warranty.
I can fully appreciate in purist terms SEAT can legitmately say you have devalued their stock asset by modifying and subsequently impacting how they can apply a warranty to that vehicle for you or future owners, but I also disagree with the Hitler approach to resolving the issue. It' apprarent from your mindset that your an articulate person, so how this cannot be resolved in a reasonable fashion by SEAT is frankly worrying.
Based on what I've experienced or heard recently for a salesman to sell me a new VAG car (after 17 years of pure unfiltered devoted VAG ownership) it's basically going to have to be free.