Hey! This has happened to me twice oneday when I couldn't fit a girl in for a fill and once were it was a very similar situation to what you are dealing with now.
A couple months back I did a girls nails, her boyfriend and 2 year old came. Sat on my couch, ran around and even took pop outta my fridge. She wanted long long nails, with extremly tough nail art and gems. Took me well over 2 1/2 hrs, she was 5 bucks short as well I was ticked. I asked her 4 times about the legth (they were very long, especially for someone who had never had nails) well she had the nerve to ask for a ride home, had no car seat. Then told a ton of people she was ticked because they were " wayyyy to long "
She didn't rip them off but I got a text asking if her friend could get a cheaper set since I made hers to long, she was trying to con me.
I never even bothered replying back, people want everything for nothing. As far as I am concerned they can take that additued and shove it were the sun doesn't shine. I agree in the comment that once you leave you own the nails, since when did nail techs start giving warrenties? We don't! There is no refuned for straight up stupidness.
(didn't she think owwee when ripping a brand new set off? like honestly how hard is it to get a file or acetone. I wouldn't even offer a free set, I bet her nails are a state. I wouldn't want to have anything to do with them after she put them through that trauma)
Good luck hun xoxo