newborn was drinking expired milk

my 3 and a half week newborn was drinking expired milk for a week and a half i kept going back to the store buying the enfamil infant formula i knew it smelled weird but everyone said that's how baby milk smells and i've had taken my baby to the emergency room last week that didn't help he won't sleep cries so much and his poop was water so today my mom decided to try the milk and it tasted like straight poison , i went to the store and told them and they opened one of the milk they had on the shelves and it was expired too tasted terrible, they gave me my money back for one milk and told me if i want to call enfamil and tell them. what should i do? oh and i bought a new powdered milk and my baby loved it you can tell in his face and he went to sleep right away.

this was the milk

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