Unable to pump water from the borewell. Need help

Hi,
I have a borewell that was assured of 4" water at 300 feet total depth. I get the water for an hour and then it stops. So I stopped using it. However when I lift the pipes and pump, I hear the sound of flowing water down somewhere in the bore well. It is really like the noise of a pouring waterfall.

Any advises on how I can stop that downpour and make it pump upwards?

Thanks in advance.

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