Packers And Movers Overcharging by taking goods hostage

Hi, I have booked a service from packers and movers to shift my household items from Delhi with an agreed amount of 35,000/-. I have paid only booking amount of Rs. 1000/- They packed and loaded my packages and the next day they sent me an invoice of 2,74,520/-. When asking they gave reason of some unknown tax (gunda tax) which Assam gov. Takes from trucks entering Assam. And after one day they gave reason of my excess packages. Police are not taking FIR in this matter. I have reached them several times. Now the packers and movers owner says your items has been unloaded in Patna.Now they are sending me revised invoice daily by adding their storage charges making the latest bill amount to 3,10488/- They denied giving me details of the location and they even did not taken transit insurance, and told me any damage will be at your risk now. I don’t know what to do, have been contacting police daily but no help. Please help me, how should I proceed further and what can be done.