DHK Moving now threatening me with legal action after trying to get my money owed to me.

I have been trying to get my money owed from DHK, i have wrote a review before this explaining what had transpired, i have in the interim contacted the client of who the cargo belonged to and he advised that he had paid them in full , Denis was copied in on the mail and this is the threatening response we get when trying to get paid. "Quote Walter

We will not entertain your claim as :

1. You *******ly made contact with our client 2. You also *******ly posted on Facebook. Facebook is not the platform to report an “unpaid” amount. It is a platform to rate service. 3. In the event of our paying any funds to KYH the Hello Peter review will remain. This does not work for us. 4. Please be advised accordingly and desist writing to our clients who are not involved, failing which we will bring an Ex Parte application which will be very expensive for you. Un-quote"

If any one reading this can offer and advise in this regard it will be more than welcomed