You should be able to pull away smoothly without hesitation or wheelspin regardless of engine type, and the fact that the dealer has reprogrammed the gearbox would suggest they know it is not working as it should. If the dealer is refusing to acknowledge there is an issue you may need to make a complaint or seek a second opinion from another dealer, but if this is the supplying dealer and the vehicle is still under warranty it is worth pursuing with them in the hope that any rectification work required will be carried out under warranty.