Think I posted earlier in this thread but can't remember and can't be arsed to look! But I had a clutch and slave fitted after roughly 4k / 3 months even with a remap, dealer fully aware and it was showing via diagnostics, one of the master techs was very anti-remap and another loved them, the technician who worked on my car said it pulled like a train. Gutted for you. VW would have to prove it is the remap causing the fault, pressure them and please don't give in and pay.
If it's through finance perhaps you could inform them that the car is broken and VW are refusing the fix, ultimately it's their car so perhaps they can pressure VW. Not sure how that would go down with the car being modified tho.
VW executive office = 08443754625
Give them a call and bypass customer services who are useless
