Mr. C. is right. You do not want dishonorable discharge on your record- it will seriously hurt your future employability. If you were serious about joining the military, don't let one recruiter's slimy tactics get in the way of that goal.
How different is what he said than what you are seeing the truth is? Is it enough to really change your mind about the whole thing? Why did you want to join the military to begin with? What is this dishonesty? Do you have written documentation of the alleged lie/ original promise?
I'd assemble whatever you have and write a formal letter to someone with more authority explaining what you were led to believe, and politely requesting that the promise be honored.