My account was completely screwed and they had two phones PER line active on my account. Long story short I wouldn't wait. They had me send phones back and are having to manually do overrides because what happened to me "wasn't possible". If you wait, you'll likely eventually be charged. And you can't really play the "I didn't know the phone wasn't a free gift" card.
Send it back. Ask for s credit cor your convenience. I'm sure they'll take care of you. I don't recommend just
Blindly doing nothing