Wrong date given to airline

We booked our return flights from Cape Town to Johannesburg. Today we are meant to return home to Cape town, we called the airline to just confirm the flight time. The consultant advised that we were already supposed to have flown back home? We booked our return flight home for Sunday 19.07 through travelstart. We double and triple checked the dates before booking. We also booked the flexi rate as as a safety net. Somehow travelstart fed the wrong return date to the airline and booked it for 17.07 return! Trying to get hold of travelstart is a nightmare on a Sunday. Skywise then informs us that travelstart booked the go-fare rate (without changes) and not the flexi rate WHICH WE BOOKED AND PAID FOR. Skywise is kind enough to get us on a flight back home with PROOF from Travelstart that we did book the flexi rate, but travelstart is not getting back to us! My husband has an urgent meeting in the morning and my kids have school tomorrow. It sickens me that we paid for the flights with additional extra for flexi rate and travel start just goes missing after the mistakes are on TRAVELSTART's end!!! Never ever book through travelstart...pay more and be safe on your travels.