Luggage arrived – Delta does not pay

It seems I am not the only one arriving in Orlando without my luggage. Meanwhile my suitcase arrived, but I had to buy and rent the golf stuff for yesterdays „Lotusphere Open“ golf tournament. Someone at the golf course told me to charge this back to Delta, but Delta refuses to do so because they only pay 25$ per day if the luggage is lost mor than 24 hours. I can not believe this, so has anybody experience with that and knows a way to get the money back from Delta?