Muffler shop mess up

Not the best pictures but I was getting a free quote on how much an exhaust system would cost and I was sketched as it was with how they put it on the lift and notice this on both sides of the side trim a day later. I don’t have any pictures of it on the lift or anything but just pictures from before and you can tell that’s not there. Not sure how I should go about this as there was no transaction but i’m 100% positive they did this. Ideally they just cut off money on how much they charge me for the exhaust as I understand mistakes happen and don’t want to force them to repair this or give their business a bad rep necessarily. What do I do if they try to argue it? Anyone know about how much in damage this is? It’s on both sides.