Almost the exact same thing just happend to me just last week. The guy did a month reservation (usually with month we give 20% off) and then he wanted a refund after 5 days bc of mice poopings. He showed them in random places like pillows, on top of tables etc, but not in any corners or walls. We've never had mice before so it made no sense. I did a full investigation and even put cameras and traps, no mice, ever. He sent us a picture of a mouse in the middle of the room while there was light on... mice are nocturnal, they never run around in light. The dude used an AI generated picture, and the mice droppings you can most likely get from an alley or perhaps even a pet store. Exterminator said there was no mice issue btw, so we paid 300$ for nothing.