Hello IngridVal,
Thanks for reaching Microsoft Community. We're sorry about what happened to your device.
When screen cracks, it can be consider as physical damage and may void the warranty if found it's user induced. Please see Get service for your out of warranty or damaged Surface (microsoft.com). Otherwise, kindly contact our support via Contact Us Microsoft Support to seek exchange options for your device. You can also contact them via phone, see Global Support Phone Numbers.
Kind regards,
StevenK