Highway ******s dressed as Car Rental

Highway *******. Picked up a car at Cape town airport on Friday and just dropped it off this afternoon. The one back tyre seem to have a slow puncture with no damage to the tyre. Most probably the valve leaking. The now charge us R749 for a new tyre while the the valve could have been leaking since Friday. A total *******. Will never ever hire a car from these highway ******s again.