I dont know what to do....
If I were you I would document everything .. phone calls, visits to the dealership, etc.. I would contact Lowe and not the salesman. Everyone answers to someone so go higher up the chain and mention how you were treated. I've had very good luck mentioning the Better Business Bureau. Also mention that you are on several fishing sites. Mention how you wouldn't want to post how you were treated and that you just want a fair resolution.