I found an ad that displayed a price of 600$ for two rooms. I was delighted because If I found a roomie it would be cheap rent. So I found a roomie and we each signed a lease for it. We asked the landlord if we split the rent and he said yes (while we were looking at the lease), so we signed. Now the landlord wants 600$ from each of us because we each signed a separate lease for 600$. Can I sue for some sort of fraud if I have the original ad?