If the toilet bowl is clogged, stopped up, and the flapper is leaking, then the water will continue to overfill the bowl and flood the home.
If the plumber didn't think there was a problem with the flapper, why did he replace it?
Do you have renters insurance?
I mean really, it's someones fault.
If the toilet is clogged, why didn't someone unclog it?
I wouldn't leave a clogged bow running in my home, that would cost me thousands in damage.
You take a plunger and fix it, or if you don't have that at the moment, you at least turn off the water.
What happens when your car runs out of gas? Do you just abandon it?
I've had to walk miles sometimes to get to a gas station to find a can of gas so I can walk back and get the car started again.