Steering Column problems of the 1997 Toyota Tacoma

The steering wheel began making noises 7 months after it was purchased new. Dealer took the dash out, replaced something and put it back together again. 7 months later the sound began again. Three letters to Toyota complaining about this problem were totally ignored. I visited the dealer in tucson, az about this and I wanted the problem solved at Toyota expense. Again I was put off and the rattle has persisted to this day. I am tired of listening to this rattle every time I drive the truck. If there is anything you can do to help me get the Toyota folks to repair, replace or put a grease fitting on the defective parts in the column, please let me know. Thank you.