Looks to me like they have turned the hex shaft around when replacing the oil pump,the worn shaft has gone past the circlip because it is worn.I suggest you take your oily parts down to the main dealer and tell every customer in the place how shoddy the work was by that garage and how the don't honour there warranty no matter how much over the odds you pay for the work. And tell the ,manager when he comes out you have plenty of time on your hands and will be down regularly until there shoddy workmanship and understanding of mechanical failure is put right. It has fail because they turned the old shaft around instead of replacing it. How bad is that! They probably didn't have one in stock so bodged it.