Q: i just got this ipad mini and i got it to start up mode but i cant get a hold of the person i bought it from what should i do

You either ask fpr a  refund or you are stuck with a device that will never be of any use to you until unlocked with the previous owners password.

Sorry

Pete

It requires the Apple ID and password of the previous owner. If you don't have it and cannot get it, then the device is useless to you. Return it for a refund if you can.

Find My iPhone Activation Lock

In the future check first before buying second hand: How to check for Activation Lock before buying a used iPhone.