The Tome of divinity bugged

I accidently deleted the quest item i need to complete the quest "the tome of divinity". it is not giving me the item "symbol of life" when i speak the quest giver again and even if i leave the quest and reaccept it doesn't give me it. i have read over and over that if i lose or use the item and need another duthorlan rall is supposed to give me another but he isn't, when i speak to him he only says hello and i have already checked to make sure it isnt in my bank. i can't complete the quest to get my revive spell. PLEASE HELP ASAP