Unitrans Alberton Imcompetent

I have taken my Amarok to Alberton Unitrans VW numerous times. I have had a problem in selecting 4x4. They connected the diagnostics laptop to my vehicle and determined that the issue (4x4 light continuesly flashing and not updating selector) was due to the diff actuator...They also picked up that the ps motor is faulty as its making a noise, they have replaced both.....My cruize control also did not work briefly and my window washer...Again I was told that the whole switch and controls will have to be replaced...Since then I have had the same issues with the bakkie and nothing has been resolved although so much has been replaced...The switches had no faults as it was a fuse and the washer pump itself...Misdiagnosis..!! I have taken my car to Rivonia which has excellent service and have been told that it is actually rodents that have eaten the wires and not the diff actuator..VW alberton seem to be some sort of ***boy gang charging and claiming for parts not close to be needed for replacement...and then the customer has to still pay in for oil etc after a perfectly working part is replaced and still has the same issue. They are now shrugging their shoulders...