Well, my opinion is that someone who complains about an automotive problem should not mention names or locations at all. There is always the risk of tarnishing someone incorrectly and in some cases could lead to consequences for the complainer.
Not too long ago someone bought a used car on an auction site and felt it was not up to par. They referred to the dealer as a “crook”, both on the auction site and on public internet forums. The dealer sued them for libel and won.
This is hardly the situation here though.
I certainly don’t blame the OP for seeking impartial answers as to any consequences and how to handle the problem, although I do think the name of the facility should not have been mentioned at this point. If push comes to shove, then drag their name through the muck.
It also seems to me the service rep should have tried to resolve this before posting anything on any forum. However, the service rep should not attempt to whitewash the problem by providing a year of free oil changes, a free “inspection” to be followed with the determination that everything is ducky, etc.
Hopefully the OP and/or the service rep will post back with the resolution to this problem.