Wiper blade rip-off

I sent a Chev Utility bakkie in for service and received a call from Standard Bank Fleet Management. Williams Hunt want to charge R700 for windscreen wiper blades and R200 to fit. Cost from Midas, about R300 and they will fit them for free. We have a fleet of these bakkies and this was the last one serviced under warranty. Williams Hunt won't be seeing us back for anymore services.