AFAIK you only get VW assist on UK supplied cars.
From the VW website:
What roadside assistance do I have on my imported Volkswagen?
Personal imports originating from Western Europe will generally be covered by a service called "Mobility Guarantee" from the country which supplied the car. Mobility Guarantee is limited in terms of the cover and duration it provides (12 months) and details can be found in the vehicle information wallet. Generally this service covers failure due to mechanical or electrical failure of the vehicle and does not provide help for such things as punctures, accident recovery, out of, or wrong fuel or lost keys. We therefore strongly recommend that you purchase our comprehensive Volkswagen assistance cover. For more information, please contact 0500 275 577.
Exclusions
Volkswagen Assistance will not provide service for:
2. Personally imported vehicles where Volkswagen Assistance has not been purchased direct from Volkswagen.