National Tire & Battery [NTB]

I went to ntb and received a oil change 8/30/19 at 6:32pm. I arrived home 2.1miles from said location and noticed oil dripping from my vehicle so I parked it. On 9/3 I got ready to get in my vehicle and noticed a large oil spill. I immediately returned to ntb to be told that my oil filter housing is busted and that they cannot order one yo replace it I have to take it to the dealer. Whyyyyy? I didnt change the oil or replace the filter ntb did and therefore busted the housing so why am I left to foot the bill.