Can life insurance be forced to go to pay debts if there are named be beneficiaries?

My dad ped away in Nov. He had named beneficiaries on his life insurance at work. He has way more debt than ets, he will have a negative estate. Creditors are threatening that we should use the life insurance to pay the balances...are these just tactics they use? Should we be concerned that the money can somehow be taken? We live in Wisconsin. Thanks!