Borewell in JP Nagar, Bangalore,Karnataka,collapsed due to loose/sticky mud and the casing pipe removed - Can a slow rig be inserted or are there better options?

Hi, few days ago, I had a borewell drilled in JP Nagar 1st Phase. They dug up to 120 ft and hit the rock and started with casing. But they could insert the casing pipe up to 95 ft only and couldn't proceed further. They said it is because the well is collapsing due to quality of mud, loose/sticky mud. They removed the casing pipe inserted and stopped the work. Now they are suggesting to go with slow rig. But it seems it will double up the cost. Are there any other options? Please suggest your opinion.

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