Didnt even realize that until you said something then I looked at the screen name.
The steering wheel not being straight is just that. The turn signal not canceling is related to the position of the steering wheel also. Sounds like the shop didnt know what they were doing and tried to reclock the steering wheel to compensate for not aligning correctly and when they did that they broke plastic that keeps the horn from honking when not is use. Then added on they needs a new column as part of the reason for your issues. When you are going down the road straight if you let go of the wheel will the truck go straight or does it pull? Ignore the position of the wheel while thinking about this.
Yes, this. Is it an actual steering pull or is the wheel just off-center?
If it's an actual pull, all the good advice has already been mentioned here. Rotate tires, check for sticking brake, check alignment, check for loose parts, etc.
I also agree that a steering box can cause a pull, but that's not a very common problem.