Beware! You may get sued if you complain!

So, after my previous complaint, Carmatrix (Deon) did not call and apologize, or try to sort anything. Nope. He decided to take legal action! Yup, his attorney (prokureuer?) sent me a letter threatening to sue me for slander if I do not retract everything I've said, and apologize publicly. I enlisted the assistance of an attorney, and the matter did not go any further. I accepted that the nonsense was now over and done with, but no...upon having no joy from the attempt to sue me/get me to retract, this company went ahead and searched for my business (bear in mind, he's NEVER contacted me or my business or transacted/communicated with it in any way - the only contact we've ever had is when I - in my private person - called him for advice and a quote), and then he posted inappropriate spam there, and also gave the business a bad rating. AGAIN - HE HAS NEVER DONE BUSINESS OR CONTACTED MY COMPANY! Yet, he first tried to sue me to get the negative rating removed, and then stooped to the level of spamming my business. I removed the spam and reported it as hate speech and as spam, so his accounts will probably be closed or warnings issued, but, jaaaa....does the term low-life apply?