Capitec Retail Card Machine

I had a speedpoint machine in my store form Capitec. I closed the store and for one month the payment for rental of the machine did not go through. Next month after I requested that he machine must be uplifted and contract cancelled the payment when trough double, to cover the amount i owe them. Afterwards no one from Captitec contacted me the just handed the account over for collection to Brooks and Luyt. Now weekly I get a call from them, and each week I ask for a statement. This is being going on for 2 months now. Each time I ask for a statement, and each time they explain I can be blacklisted if I don't pay.