Unhappy

We bought a Ford Ecosport on ending April within a few weeks after sale having issues with gearbox we asked WesBank to intervine on our behalf. Which they did we got 3 reports that gearbox was faulty. The dealership told us to bring vehicle back. They send vehicle in for repair stating it was a thorn gearbox mounting and oil. When we went to pick up vehicle we stated a few times it the gearbox and not gearbox mounting we wanted a report they didn't comply. We stated if gearbox is still faulty we will return vehicle for their expense to be repaired. About 2 weeks after gearbox issue was again the same. We took vehicle to dealership he stating he won't pay for anything we must take vehicle to dealership that repair before. My wife stated the facts telling them vehicle must be left there. This is already on 19 August vehicle still there a week after my wife left vehicle there she phone dealership repairing saying gearbox was removed for diagnosis. We got a email stating my wife brought in vehicle for repair not correct fact. We asked WesBank to intervine again Dealership saying he will only pay half of repair R39 080 but this vehicle was bought with a faulty gearbox we did complain in given time why must we pay other half when vehicle was returned 1st time stating gearbox problem they did not comp**** I am not happy with thus purchase neither with dealership what can be done