I had exactly the same problem after having mine fitted, it was pulling badly to the left and steering wheel was off centre.
I had it booked in for a 4 wheel laser alignment knowing this would be the case.
I had it done at my local STS and it was spot on afterwards. The drive home on the motorway after having them fitted was very scary! the car was all over the place
They told me the golf has 3 points of adjustment and at £30 an adjustment worse case £90.
They only had to adjust 2 points so obviously it cost me £60. Handled like a dream afterwards.