Your landlord may or may not be a bad guy. The Texas Property Code, clearly reads, that if notified by certified mail, the landlord has 7 days to respond. It's that simple.

That is a sticky situation. While the landlord is obligated to make necessary repairs to your residence, you are obligated to make payments. Where it does get sticky is that a leaky toilet will be seen by many as an emergency and should receive immediate attention. However, you are not obligated to make repairs yourself, so by sending someone away (regardless of who comes to do the repair), you now assume the responsibility of that repair (not that I would agree with such a delayed response on the part of your landlord) If rent is owed, rent is owed, and the landlord can pursue it and/or eviction as the law dictates. The best way to try to avoid this kind of conflict is to contact management directly and go over all options. The severity of a repair like this is usually enough to get someone further up the corporate food chain to force action.