There are currently no known fix for the uconnect issues.Well said.
I was curious, what did the dealer end up doing to resolve that mess?
You can try to look here to find related issues but they mainly deal with 2018 models, since you have a 2019 most won't apply:
The dealer may try to update software, but issues could still persist even with the most recent software.
But pulling fuse F97(uconnect) and F11(usb) can force a hard reset and temporarily resolve most uconnect related problems.
EDIT: Look here as it appears they have a new update for the radio, maybe try this
P.S. Let trolls be trolls, put them on ignore list and don't feed them and eventually they'll get bored and move on.