Bay Area Home Buying Deal Issue

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We signed a contract with the seller that stated " Seller to pay for repair costs for the items discovered via inspection" . This is because seller had not done any inspection and only shared the disclosures. During inspection we discovered water in stagnant crawl space and inoperable sump pump (This wasn't disclosed by seller). We had inspection done from licensed people

(termite+ home+ roof+foundation) and found more $15,000 worth section 1 , section 2 and foundation issue, sump pump repair. Now the seller refuses to pay or fix the issue himself. They claim these are cosmetic changes! We have spent more than $2000 on inspection. Please advice what are my options?