North Texas is well known for expansive clay soils,prone to the type of problems you describe. There is an entire industry devoted to repair of such problems. My recommendation is to hire an independent structural or geotechnical engineer to evaluate your situation, and recommend the best solution. Unfortunately you can get multiple bids from foundation repair companies, and still know very little about how their solutions will perform. An independent engineer should be able to give you a disinterested opinion on the options for repair, probable approximate cost, and the likelihood of long term success.
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