And did you contact support
if you're on Facebook you can join local neighborhood and mom groups and post that you want to trade that formula for the one you actually want and see if anyone can help you out. they also have buy/sell/trade groups for baby items in my state so if you're in the US you can try seeing if there's one for your state
Or you could give it to someone who may need it.
You should be able to send it back does it tell you can't send it and get a refund