well if you have had the alignment checked a few times and they say there is nothing wrong either the cannot work there equipment or they are telling you lies, a quick diy way to check camber i to park on flat level surface an take a spirit level to the wheel, hold i plumb an measure into the top of the wheel do this on both side and if one side is bigger than the other then you know you have a major problem, it doesnt take much to fuc up your alignment and scrub tyres.
i had the alignment set up on my van after fitting the coilovers i then decided it was to low and raised it 20mm and i started to scrub the front tyres so fitted higher profile tyre and lowered it again