Banned for Life
When I was working for a restaurant delivery service I had a customer send in a complaint about hair in their food. The hair was sitting on top of the food. I check their account, and they had ONE order on their account, which is a red flag.
I check their phone number and find multiple accounts, ALL of them complaining about hair in the food. I deny a refund because the customer has actually used the same identical photo before. The customer tries to argue with me and threatens to never use the service again.
Eventually the customer gives up and ends the call, then immediately tries again. I see who it is, then deny the refund again. The next day she calls back and demands to speak to a supervisor. The supervisor banned her from the service. Story credit: Reddit / Sarchasm-Spelunker