Sounds like they put a bunch of random parts in a box, and shook it up and called it a kit. :can't look:
Stuff happens every now and then, but this is just nuts. TCI isn't going to make any money on your "kit", that's for sure.
I bought some camper tiedowns that slide into the trailer hitch frame, and one side didn't fit on the extender bar that was supposed to slide into the piece that went into the hitch. Got hold of them and rolled into the manufacturer's site on the way to pick up the camper and they swapped it out for me with no problems. They didn't have to ship anything that way.