I got my new phone in the mail. However, I noticed an email saying my trade in credit is $100, when I thought trading in any s series phone (s10+) would make me eligible for a 1000 credit. I now want to return my new phone, instead of sending in my old s10+. I am in the final day of my return period. Can I take my new phone to an at&t store to return it instead of mailing it, so that it qualifies as being in the return period?