I would sugest that you request verification of the debt in writing from the collection agency. They will have to stop collection until they provide you written verification of the debt. If they fail to do so they will be violating the Fair Debt Collection Practices Act. "FDCPA"
In addition you may be able to bring suit against the contractor under either the Texas Deceptive Practices Act and/or The Texas Home Solicitation Sales Act.
See the following link for more information. https://www.oag.state.tx.us/consumer/3day.shtml
I would also suggest you contact a consumer protection attorney. You may be able to find one at www.naca.net. Search your area and get in touch with one in your area.
I hope this helps.
Ronald Frederick & Assoc. Co., L.P.A.
1370 Ontario St., Suite 1240
Cleveland, OH 44113
The easiest way to begin a dispute with a collection agency is to submit a request for verification of the debt. you can find sample debt validation / verification request letters online.
If the contractor completed their repairs, they are entitled to payment, you may be able to offset that payment by the amount of damage that they caused (and which can be verified). If the amounts are substantial, contact a local consumer attorney for fact specific guidance.
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