The volt advisors were about the same level of help as the "GM Reps" here on the board that are actually just "GM Social Media" people.
Never actually gotten any help from them, and one of them actually cost me $1k due to giving me bad information about the private offer code I had in my hand. Long story short, ordered a Volt, had a private offer, took longer to build so I asked if the code was still good, they said 'no', literally (and I do mean literally) 45 min after signing the papework and taking delivery of the car they called saying "wait wait wait, we were wrong, the private offer code is good". Didn't do any good, GM wouldn't fix it, and I was out $1,000
For my trouble all they sent me was some cheap pens and a hat which I just threw away. So yeah, bang up job GM, keeping your customer support team on top of things... or at this point even existing.
Same level of help (zero) when my 2017 died at 4,000 miles, and then again at 8,000 miles. They didn't care in the slightest that I was in a gas burning loaner for almost a month. Nothing like making payments on a $40k car and driving around in one that cost $20k.