You can find the certificate number and PIN in your insurance certificate, which was sent to you in the order confirmation email.

You can report a damage claim here.
simplesurance GmbH
Hallesches Ufer 60
DE-10963 Berlin
Managing directors:
Robin von Hein, Joachim von Bonin, Manuel Kester
Registry court:
County Court Berlin-Charlottenburg, Germany
Tax number:
37/104/50251
VAT number:
DE283131437