2010 Golf 1.4 TSI

Had my Timing chain + Tensioner and all associated work replaced at 40,000 Km (Mid 2015) (under used car warranty)

CEL light comes on recently - take it in last week.
My chain is stretched and timing is out.
P0012 code on my code reader

Now November 2016 at 47,000Kms my timing chain + tensioner and all associated work complete again. This time it is a 'repair kit' with different number codes to original equipment.

Guy at VW tries to tell me there is NO WARRANTY on their work this time because it was a warranty repair and I didn't contribute to the repair.

When I press why a major engine component THEY installed can't last 1yr or 5000km's I get blank looks and avoidance.

You believe this ****?