Electrical cable stuck in borewell in Hyderabad, AP - Need to know the cost of removing the cable

While reinserting the submersible pump after repairs into the borewell the electrical cable fell in. We were able to retrieve the motor  and about 100 ft of the cable after that the cable appears to have got entangled inside and is stuck. The bore is of around 850 ft depth. Is it possible to remove the cable without damaging the cable or the borewell as new cable will be very expensive? A local agency I contacted here says that they will charge at least Rs.10 per feet of the bore well. Is this reasonable?