craigslist.org craigslist Unfair and discriminative advertising practices unknown Internet

I work for a car lot. All car lots are being charged a $5 fee for each post. Only car and truck sales are being charged this! Motorcycle, RV`s and other source of transportation dealerships are not being charged in this manner! I posted an ad 2 days ago and paid their $5 fee. The posting is suppose to be live for 30 days and then you must pay another $5 for another 30 days. I posted a vehicle for sale on Aug.19 it was then deleted after 2 days! You can not contact anyone on the phone at craigslist. You are only able to contact through email (This includes law enforcement too). No refund is being offered but yet craigslist still allows people to flag a paid ad off the internet! For all I know craigslist is doing this for more money???? I would like to get in contact with an attorney to start a lawsuit for discrimination since it is only car and truck dealers that only have to pay this fee. This is not right! Craigslist is a business so therefore they should be able to reset the ad so it stays on for the 30 days I have paid for!