Urban Company — They broke my cot and not responding

I have recently (30th august 2020) hired amar packers and movers for moving from banglore to chennai. I got their quote and accepted it after entering my request in urbanclap app. They have not assembled my cot in chennai saying it would be best to call a carpenter for fixing it since the team that came here did not look like they had the expertise. I said ok trusting them. Now when i called a carpenter they said it cannot be assembled because most of the screws (Round screws which are used to lock) are broken since it was not disassembled properly and some are missing as well and i am not even able to find those screws anywhere. I contacted the amar packers and movers team and they are not responding at all. I would not have hired them if they did not come from urbanclap. I have even taken insurance for my goods on their recommendation. Please help me to get this fixed as soon as possible. I have infants at home.