Hey guys... Come on, we're talking about GCG turbo's here, not some backyard outfit.
There are a lot of things that you need to take into consideration - what these guys go through every single day, they probably get a dozen of these claims a week and 90% of them are probably due to the owners (or mechanics) failure to keep up maintenance on the turbo, so when they get one like this they have to look at it in an unbias way...
Im not saying that you damaged your turbo, Im only saying that there is no possible way for you to be sure that there wasnt any oil contamination or any other unforseen problem, and there is no way for GCG to be sure that you didnt do something to the turbo or the engine to produce the damage.
GCG have been great to me, very helpful and informative and willing to chat... They wouldnt have the name that they do if they didnt do a good job.
You can please some of the people all of the time or all of the people some of the time, not both.
Sorry to hear it though mate, I wouldnt be happy either.