So
@DuraYuk you are basically saying this guy should keep his mouth shut and just let the dealer not provide any type of customer service level to try and satisfy his requests. Since GM has in place no need to document any type of work that might be done on a vehicle until it's actually completed, he shouldn't ask questions and inquiry about it cause nobody besides a tech actually knows what's going on with it? If that's the case, then it's just another example of GM's horrible processes that need to be addressed and changed.
If this situation is going on 2 weeks, The least a dealer can do is make arrangements for a loaner. That should be addressed by the dealer going into business day 4 if they know its going to take much longer cause of different various issues they might be experiencing at the shop.