Is it permissible for my siblings to force me to sell my share of inheritance land in exchange for a debt I borrowed from them, knowing that the sale took place under duress and after procrastination in giving me my share?

If the land inherited from your father cannot be divided without causing harm, then it should not be divided except by mutual consent or by some of you selling your shares to others. If one of the partners requests to sell it and divide its price, the remaining partners are obliged to sell, and the ruler can compel them to do so if they refuse, based on the Prophet's (peace and blessings be upon him) saying: "There should be no harm nor reciprocal harm." Your brothers do not have the right to compel you to sell your share solely to pay off your debts. If they lent you money and then insulted you, they did well by lending but erred by insulting.