I’m assuming you did the inspection during the time you have to walk if it doesn’t come back clean, most do. In this case, even if the seller would fix it, I would still walk. But, if you have to have this particular house, then the seller should pay for an inspection that includes the slab, and under the slab, maybe there is a broken water pipe under the slab which is costly to fix.
If it was me I’d run away, but if you only put a few thousand down and you agreed to a contract that doesn’t get you out, then walk away and lose your down payment. No need to talk to a lawyer, you have the contract. Also, the seller has to disclose any issues, so if they lied, you have them by the short hairs and you can get out.
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