If not, you can call the number 0486 19 19 99. My colleagues from the customer service are available 24/7 and will be happy to provide you the puk code. Mind you that an identity check is needed. So they will ask you your phone number, your name, your date of birth and your address :8 . Do you have an anonymous prepaid? Then registration of the prepaid needs to be done in order to provide the puk code. In this case you will need your ID-card close by, because the document number needs to be registered as well.
In case you already have a login of the Customer Zone, you can login and find the puk code there. No login yet? Then this won't be an option for you since you will need to be able to receive an sms to request a password.