Most service centres use 3rd party centres (Reason - Extra income for the advisors)- in worser case stock alignment machines are purposefully made faulty by some advisors .
What machine was used by the alignment centre - Moving camera type or fixed camera ?
If its the former , better try in another centre , if latter , check whether the alignment changes after 1k km , if so , then the centre is not qualified. A good technician , and well calliberated machine always proves alignment precision for more than 5k km , in our road conditions , though its a well done job for 10k km