Hope you're ready for Amazon to hit you with a $250 fee. You should of just paid the extra $10 a month for the additional line like the rest of us. See Below:
AmazonWireless
AmazonWireless Instant Discount Policy
When you purchase your device with service from AmazonWireless.com, we automatically pass along an instant discount from the carrier to you. This discount has been provided to you based on your agreement to (a) activate a new, or extend an existing, line of service for this device with the carrier, and (b) maintain this service in good standing for a minimum of 181 consecutive days.
If you do not activate or extend a line of service in connection with this device, or if your service is canceled/disconnected before 181 consecutive days, AmazonWireless.com will charge you $250 per device, plus applicable taxes.