I completely understand your intent on wanting to post your disclaimers as a way to reduce spam, bots, trolls and time wasters. All businesses have this same issue to deal in some respect.
I would say as someone browsing potential hires, I would probably not attempt to connect based on the stern tone. I think there is a better way to edit that message a bit without sounding like everyone is annoying you. I also would pass because of the booking fee as it comes across as self righteous. I am not a provider, so I’m not the expert at advertising your services, but I know in other businesses, this would be a turnoff to potential customers.
I think advertising should focus on engaging the client to book you without hesitation. There has to be an allure or something that creates the desire to connect. Marketing 101. Selling, marketing, advertising is all a game. Stay focused on winning people over, not pushing people away. Disruptions, as annoying as they can be, is a part of business. I would guess that if someone reached out more than once as a follow up is someone who is interested…just in case you are truly bombarded with the amount of spam, etc that you described. People want to connect with someone who comes across as sincere, genuine and appreciative. You attract more bees with honey.
My two cents as a business person, and client. Wishing you success.