the reason that your wheel is not centred after someone has done the tracking, is cos they have been lazy b@st@rds and adjusted it on one side, not both, my local tyre spot screwed up my wheel position free of charge, had to take it back to them 4times until they sorted it to back how it should be.
Take it back to them and insist they do it right, don't go moving the wheel on its splines as nothing (the rack and everything associated) will be off centre when you come to do further adjustments.