Sold mineral rights in CO to a buyer in 2017. Buyer's due diligence came up with Net Mineral Acres (NMA) about 15% short of what we thought we had. We hired a landman to verify the NMA and the landman validated our holdings. How would we proceed now to get paid for these validated acres? Is the original buyer legally liable to make up the difference to us? Or do we try to find another buyer?