Internet service provider

I have had the most ********** experience with Webafrica. I placed an online order for one of their packages and eventually a consultant called me back. After 3 or 4 very unprofessional interaction and taking all my personal details including my banking details, they informed me that the package I had chosen was not available at my complex and tmit needed to be cancelled. I agreed and they confirmed it was cancelled. I then received a router via courier which I returned. I contacted them immediately indicating that this router should have not been sent as I cancelled the order. I have now received an invoice of over R800 for services I HAVE NOT RECEIVED!! I canny get through to anyone to discuss this with, the whatsapp number is useless and I now cannot get a new service provider because it reflects that I have this stupid webafrica product WHICH I DO NOT HAVE. I have emailed numerous times requesting for a manager to call me but nothing has come of this. I am extremely outraged by the service I received and I cannot seem to talk to a human being. I need this resolved asap or I will have to explore what other options I have because this company is taking advantage because they have my personal details and I cannot seem to get anywhere with this stupid company. CONTACT ME URGENTLY!!!!!