For a general overview of your rights in a collection situation, please see the Bills.com resource Texas Collection Laws.
Your case involved a lease contract I have not read. You have the added complication of a spoken contract that apparently modifies the terms of the written contract. It would be folly for me to offer an observation on your situation without a) reading the contract, and b) interviewing you to understand the content of the spoken contract.
Consult with a Texas attorney who has experience in contracts litigation. I realize an attorney's time is costly, but your alternative is very, very expensive if the creditor wants to extract $29,000 from you and has no legal basis for doing so.
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