Steering pulls left, not alignment

I brought my 2013 Ford C-Max Energi in for an oil change and tire rotation, and they told me I had "swollen lug nuts", which they replaced and did the rotation. As I drove out, I immediately noticed the steering pulled left. I brought the car back for wheel alignment, but that did nothing. Then they said they replaced the "C-brackets" (I might have this part name wrong) and then the "tie rods", and still the steering pulls left. Now they want to replace the "steering rack" because they say the "sensor" may be at fault (they quote a price on the steering rack of over $1000). I'm guessing they might have bent something trying to take off the swollen lug nuts. Does anyone have a suggestion on what could be the problem?