Non-service delivery of a bad company

I signed up with this company a couple of months ago. The payment was by debit order and I requested that debit must be done on the 2nd of each month. On the 2nd of April, the payment went off but I got concerned. I started receiving sms-messages saying that my arrears-accounts was cleared. But my question is how do I get an arrears account? I took up with a lady called Philla and she promised to look into the matter. I never got any feedback on the matter. On the 16th of April I decided to reverse the debit order for the month of April as the data was not loaded. I also could not get any response from Homecloud or Philla on her Whatsapp number. Fact is, she didn't even read my chats. Now suddenly, I get an invoice from them for R631-00. Itold Philla that am not using their services any longer. Ireceived callsfrom two agents wanting to know if I will reconsider. I told them I do not want to continue with the lack of services. Many people on Facebook is complaining about non-service delivery.