hi can anyone help iam at a total loss, my focus violently pulls left to right more so the left i can be driving perfectly straight and the call can pull severly to the left in a jerking motion and at this point my steering wheel is showing the tracking to be out, then the next minute i can hit a small bump on road and again it pulls violently back to the right, and low an behold my wheel alignment is ok again.

it has new wishbones
new wheel bearings
new tie rods
new track rods
and has just 1 week ago passed its taxi licencing mot

one other thing my tyres have worn from new to bald in 9 days

any help please