Mr. Tire review: Truck tires

I purchased 4 tires and from the beginning they caused a shimmy from the front end that wasn't there before. I've taken my truck back 4 times and they still have not fixed the problem. All they are willing to do is rebalance the tires. They said that I purchased "cheap" tires. Aren't inexpensive supposed to perform like any other tire?
I am finished dealing with Mr. Tire in Eldersburg, they are the worst tire dealer in Maryland.