iphone 6 S

phone today decided to start setup by itself. can't get past the Activation and a Activation Error shows up.

Activation could not be completed. Please restore the phone and install the latest version of iOS and attempt activation again. if the problem persists, please contact customer support.

Tried connecting to laptop and restore but unable to do and tells me to contact customer support?

what do we do? is this beyond repair and how to I activate?