If I'm under contract for a new home and the builder misrepresented the lot that I purchased, do I have legal standing to sue?

Question Details: About 8 months ago when I was purchasing a lot I was tole that it was a flat rectangular lot. I then signed the contract and put down a $6000 deposit. At my ground breaking last month, I find out that there is a significant hill 25 feet tall and my property line is 16 feet up the hill, which has reduced the usuable flat backyard to about 19 feet from my back porch. Though the description of the lot was not included in the contract, they have since apologized over email and voicemail for the mistake but are only offering about a $1000 upgrade for this mistake. I am concerned about drainage they say there are swells along the house to push water to the street drains and upset that they have reduced the value of the lot I thought I was purchasing and feel very much like they need to add value back to the house for their mistake. Do I have legitimate grounds?

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