This looks like the same thing that happened to my reverse PM! I took it to the LV store and they were able to put some "cream" on the canvas. I can barely see the damage now.
And yes, the SA told me we need to be extra careful with hand sanitizer around our bags. EDIT: Sorry for the double post!
My store had it out and asked us to use it on our own. I'd be upset if they did what yours did. However, this is also why I am not carrying LV bags and only using slgs right now.Before going into a LV Boutique, they squirt hand sanitizer into your hands!!!
I got such a large squirt in my hand, I was afraid it would leak onto my handbag!