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I am sorry to hear about this situation.
Regardless of whether or not the issue was caused by tenant or by the landlord's lack of maintenance, the landlord still owes the tenant a warranty of habitability under Texas Stats Property Code, Title 8, §92.052 et seq. This means ensuring that the property is fit to be lived in.
If the issue was caused by the tenant, the landlord can later BILL the tenant or add this on to the rental amount. However, they cannot simply ignore the issue regardless of whose fault it is. So by not fixing it, they are committing a wrongful act.
Someone in your situation then wants to send the landlord a letter demanding in writing that the issues be fixed and provide a reasonable amount of time (presumed to be 7 days) to do so. If they do not, the tenant then has the option to:
-terminate the lease without penalty, or
-have the condition remedied and deduct from the rent, or
-sue for damages and injunction to do repairs not exceeding $10,000.
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