Tracking errors don't usually cause the car to pull to one side unless it is a long way out, the most common cause is uneven tyre wear, otherwise it could be a camber error but that is generally not adjustable and caused by damage to the suspension. Have they refitted your wheels to the opposite side of the car?

If the ouside edges are wearing the the tracking is out, the wheels are towing in to much. But that could have been a long standing problem which has only no shown up because the tread is getting low.

Edited by Peter.N. on 27/10/2016 at 10:53

Thank you very much for all your answers

If the ouside edges are wearing the the tracking is out, the wheels are towing in to much. But that could have been a long standing problem which has only no shown up because the tread is getting low.

yes the outside edges of the tyres are bold that's why I took it to Halfords to get the wheel alignment as had the wish bones replaced aswell and had to go to halfords to get wheel alignment as my garage said they couldn't do it there