Lack of Response on ******* Renewal of Contract

I sent an email to customer care at MTN stating that my contract had ended and they were not entitled to bill me after June 2017 and received no response. I then logged a complaint regarding MTN's ******* practice of continuing to charge me after the cell phone contract had expired. Alice van der Merwe responded and said that I had to give notice - this is against the CPA . Alice van der Merwe has not responded and now I receive another invoice!!!!!!!!!!!!!!!!!!! MTN wake up!!!!!!!!!!!