2007 audi TT 3.2 not starting after fill service
 

Today i took my tt for a full service, it was road tested after the service, Within an hour after being tested i was called to pick up the tt where it just wouldnt start. The engine turns about once and sounds like a dead battery!! Tried jump startin it but there was the same turn and sound of a dead battery. The mechanics where dazzled, can anyone help??! Tell me what the problem is?!?? The car was bought about a week ago runs smoothly but might of had been sat still for a while.