NHTSA Complaint #11541245 — 2016 FORD F-250

Death wobble. I took it to Vallery Ford in Waverly Ohio. They told Ford recommended that the steering linkage be replaced. They did that and told me the truck was repaired and ready to pick up. I picked it up and as soon as I got over 45mph and ran over a seam in the road the death wobble was the same. I turned around and took it back. They acted like they didn't believe me. I waited about 1 1/2 hours and the service manager finally drove it. When he came back he apologized and said he thought he was going to die. So I left the truck there again. The next time they called to say it was repaired I went back to pick it up. They replaced tie rods, ball joints and track bar ball joints. I drove it home and it kind of bumped along and the steering wheel wasn't straight it was off center to the right. I called them and they told me to bring it back again. I waited at the dealer because they said it would only take about an hour to realign it again. When I drove away the steering wheel was not straight, it was not straight to the left. Turned around and took it back. They said maybe one of the tie rods was defective. I left it there. After about a week and a half they called and said it was done again. I picked it up today. As soon as I got over 45mph the death wobble was back as bad or even worse before I took it in the first time there. I left it, but they said they don't know what else they can do. It's not safe to drive. I'm 68 years old, I am lost over this. What can I do?