Did they actually put any oil back in it?

How did you get on with the goodwill contribution? My wife was driving her Seat Altea Freetrack 4 (which uses the same Haldex 4wd system as the Golf). It was serviced at the end of August including Haldex oil change by a Seat Dealer. We went on holiday for 3 weeks, when we got back she drove the car which produced a high pitched whine then the rear diff seized and then broke. Sounds exactly the same to me. We are waiting for the whole bad news story on cost but the dealer was very quick to say that this couldn't have anything to do with the Haldex unit but it sames a strange co-incidence in a car that is just over 4 years old and has covered only 42,000 miles. Did they put enough fluid back into the Haldex unit or did this fail causing the rear diff to seize?