Broken screen with antitheft what to do?

Hi support.
As the subject says, i have broken my screen and it is useless. I have used another phone with my sim and now when i put the sim back in the broken phone with the antitheft program i get the alarm message the phone has been lost or stolen!
All i want is to deactivate the antitheft program and set phone reset to factory settings. But i cant acces the phone memory from pc because of the mobile security i think. Can you please help me acces the phone memory from pc and delete antitheft when my screen is broken and useless??

Best regards

answered via email.
please stick to one line of support.

Just send a sms with the unlock command to your phone ??!!