Pump stuck in the borewell beacuse of silt - How to remove it ?

Dear Sir,
We were using a borewell for past oneyear, its depth is 500ft. Last week the water yield suddnely stopped from the borewell. We asked plumber to examine, he told that the pump was stuck at the bottom of the borewell, that means at 430 ft level beacuse of silt coverage.

We tried using chain pulleys to lift the motor, and we tried flushing it 3 times, to remove the silt, finally we were that the silt was at around 200ft which has covered our borewell fully. Is there any solution to remove the silt and motor from the borewell.

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