Removing and reseating front wheel makes disc brakes rub
Ring the bike shop before doing anything.  They may prefer you take it back to them rather than try to fix it yourself. 

All it probably needs a calliper alignment. Briefly - Loosen the two bolts holding the calliper so its free to move but is not sloppy. Slowly bring the brakes on while spinning the wheel. Once the brakes are on tight, without releasing the brakes, tighten the bolts a little. Pump the brakes a few times while spinning the wheel then fully tighten the bolts. Look up how to do it on the internet if in doubt.

Use a torque wrench if you have one. If not, do not over tighten the bolts (Pay attention to how tight they were when you loosened them).