Need advice on a suitable pump for borewell in Bangalore, Karnataka

I got a borewell dug for our residence, details are as follows:

1. The bore site is located at 97, 4th Cross,Muniappa Layout, Nagenahalli, RT Nagar post   Bangalore 560 032.
2. 10" PVC casing upto 80ft and 6 1/2" bore with MS casing upto 165ft
3 Date of construction 22 May 2009

The borewell contractor in its report states: Total depth 455' depth, Casing inserted for 165ft, Water struck at 180ft depth, 400ft Boulders and silt, Formation of soil boulders and silt. At 180ft depth Total yield (measuring method V notch method) 2". The contractor recommends air compressor to be used for pumping. A local vendor did a spot inspection by by introducing something like a piece of brick tied to a long nylon thread and on reaching dead end said the depth was 160 ft. I am not satisfied with this finding because I had been present all through the boring operation.Kindly advice what is to be done to enable me to use the borewell water free of trouble

Anto Rodrigues