Expired goods

I purchased a 6 pack milk from checksave in Phoenix plaza yesterday around 4:30 and when i reached home i unpacked it and the milk was expired and one of the milk box had half milk even though it was sealed. I then went back to the store today only to be told that they cannot assist and i need to come back when the rep comes in. Im healing from a broken leg and i made thr manager aware of this but he was very inconsiderate. I still have the milk and my receipt but no feedback