A.L.
By law they have to fix it. Give them written notice for it to be fixed, include in it that by law you have the right to break lease without penalty if it is not fixed in a timely manner and that you will contact the Texas Renter's Association. I went through something simular the first time that I move out on my own and once they realized that I knew my rights as a renter, they fixed the issue promptly.
Good Luck!