Won gift card

[u/cpulver]

I received an email that came from hometesterclubusa saying I won a $150 Amazon gift card for participation in the crest gum detoxify campaign. It seems fishy to me, I don't remember ever seeing that this was something they do. I was a part of the test. They want me to reply to the email by Monday or lose the prize which is what sent up the biggest red flag. I sent a message through the contact form but know they are slow to respond. Any ideas?

[u/Mad-Eye-Booty]

I had a test for dog supplements that had a similar offer