To open a case with Technical Support, please see the following article that describes how to open a Support Case.
How to Use the New Web-Based Case Creation Wizard!
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClFJCA0&refURL=http%3A%2F%2Fknowledgebase.paloaltonetworks.com%2FKCSArticleDetail