Tablet received back without being repaired

I just returned from Vodacare Canal Walk after having being contacted to collect my Xperia Z2 tablet which had to be sent to the advanced repair centre. I took my tablet in last week Friday for repair as a yellow spot had appeared on the screen. The spot is only visible when the display is white (settings, contacts, web browser etc) and when being held in portrait as the black navigation strip at the bottom of the screen covers this. I was most impressed how Vodacom kept me updated as to the status and progress of my repair and even more impressed that I had been informed to collect it in under the 7-14 day repair window.<br> This was short-lived however when I went to collect it only to discover that the repair had not been performed as the tech \didn't see the spot."Do the repair technicians not even read the fault descriptions when they asses the device for repair!?<br> The device has now been sent for re-repair and several notes made regarding the fault. It is completely unacceptable that my tablet was not repaired the first time and that the technicians were too lazy to properly diagnose and repair my tablet."""