What is Security and privacy law for pilgrims?

Salam, I hope this message finds you well. I am writing to seek legal advice regarding a sensitive matter I am currently facing. I have received violent and hateful messages via WhatsApp from an individual(I know) residing in Saudi Arabia. The nature of the messages includes threats, harassment, and hate speech.

As I am not residing in Saudi Arabia, I would like to understand the following:

What legal options do I have for filing a complaint against the individual in Saudi Arabia?
Can I file this complaint anonymously to protect my identity?
What is the process for submitting such a complaint to the Saudi authorities, and what evidence do I need to provide to support my case?
I would appreciate your guidance on the best course of action to ensure that my complaint is properly addressed without compromising my privacy. I am open to any recommendations you may have regarding the handling of this matter.

Thank you for your assistance. I look forward to your response.