Very bad service from Home-Connect

I downgraded my service in March a month in advance for May. May I received an invoice for the same upgraded service fee which i downgraded. They disconnected me as i was waiting for them to fix the problem. I paid the amount which left me R200 in credit which i received a credit note for and my new invoice for june which was R1698 - I paid R1600 minus the R200 in credit i should be paid up to date with a credit or R102. My services was just suspended stating i still owe R222.49. I dont know what is going on with Home-connect but in the 4 years i am with them i never had such poor service from them. My account is not correct and i should not be suspended. I think of cancelling my lines and go with another company. In the four years my internet is paid on time always. The make mistakes and the client must suffer. This is really poor poor service