Charge them replacement frame and any other parts damaged, keep the money and continue to use while giving it an occasional going over.
@AngelD started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Charge them replacement frame and any other parts damaged, keep the money and continue to use while giving it an occasional going over.