Gearbox leaking

21/7/2015 took my Mazda bakkie for an 80000Km service and was advised that brake pads/shoes need to be changed, I simply gave such permission. 28/07/2015 it leaked gearbox oil like never before and my complaint was likely treated yet they filled the oil when servicing the car,it was taken and I received it back on the 30/07/2015 but it could hardly start then I was once again told my battery suddenly packed up,eventually I replaced a battery . surprisingly on the 14/08/2015 gearbox oil leaked again,I routinely taken it and received it back on 24/08/2015. I on 30/08/2015 checked it underneath I then realised it was leaking.THE SERVICE DISHED OUT TO ME IS TOTALLY APPALLING. PLEASE help.