No fingerprint button on keyboard for touch id

You must have purchased the base model ($599 retail in USA). To get 512GB storage plus touch id, you need to get the $699 model.

If you've had it less than 14 days you should be able to return it.

you have a limited 14 days for an exchange or refund for any reason—see  Returns & Refunds Order status

Returns & Refunds - Shopping Help - Apple

Only items that have been purchased directly from Apple, either online or at an Apple Retail Store

Your 90 days of complimentary telephone support begins on the date of purchase.

Call Customer Support  (800) MY–APPLE (800–692–7753)