I entered a contract under false pretenses. The sa...

I entered a contract under false pretenses. The salesman took the liberty of adding on a interior /exterior package & explained it to me as they would fix any stains in the seats/carpet and detail it when that happens. I thought great I will get it cleaned every 3 months making the 700+ worth it. When I called to make my first appointment they said they didn't do that. I was like well I paid $700+ for it so it needs to get done or get taken off my bill. They said I can't take it off even though I was lied to. I am thinking about hiring a lawyer because this would not have happened if I would not of been a woman shopping solo. Luckily I noticed all the other add ons he slipped in and had then removed before I signed .