Water pump plastic broken

[Tlightfo]

finally able to get the water pump off, one screw took two days...when i finally got the water pump out, the plastic impellers were broken off, and the crankshaft looked like where the impellers hit are damaged...crank case??? what now? this im sure has happened to others, had a hard time removing the gasket as it was connected to other parts of the engine, like the last person to change the pump attached it to the engine somehow...