Okay. Let's use a little logic here. First, we make some assumptions.
1. The brakes were not touched
2. The vehicle did not pull prior to any work being done
3. Rims are new
4. Tires are new
5. Tires are the correct size left to right (look carefully at this !!!)
5. Only "work" done to the X: alignment OF ALL 4 WHEELS
6. Front tires were swapped on the rims
7. No other work done
8. Nothing else touched on the X

Ans.: The alignment is wrong. I don't care what the dealer says. The alignment is off. Is it possible only the front tires were aligned and not the back?

Try a few things:
Make sure you received the correct tires. I have seen where the sizes were wrong from the supplier. Example: 235-40 and a 235-45.

Just for a few miles, flip-flop the two front tires. I know they're directional. But 10 miles won't hurt them going 'backwards'.

Next, have someone follow you down a straight road from behind to see if the X is "dog-walking" down the road. If you're not familiar with the term it's when the rear of the car is not following the track of the front of the car.

Good luck.