Wheel alignment

I have a 2003 Toyota Tundra truck. I took it to have wheel alignment done and purchased a lifetime alignment. Prior to aligning I had the tires rotated. Since then [8to10 weeks] I have been back 3 times because it still pulls right. The steering wheel is out of level and keeps returning out of level after each adjustment. I was told that they did not over ride the factory setting and have now done that and everything should be fine. It is not it is the same as it was.I know that tire ware an contribute to the problem but as I said they had already been rotated. Toyota dealer says they do not have to over ride anything just do the job correctly. Today I was told the crown in the roads is causing the problem. Never heard of such a thing in 45 years of driving, nor have I ever had such a problem on any other truck. Help! What is causing this or am I being told stories because they don't know how to do it right.