Webafrica has possibly the worst service I've ever encountered

Webafrica service is beyond terrible. I received a LTE sim card which has not worked for three weeks now. I have spent over R100 on phone calls and reported the fault three times and no technician has been able to assist me but promise a call back which never happens. I tried to cancel the service but they want two months payment for a service which never worked and I have to pay the courier fees. Their call centre does not answer the phone, their whatsapp support does not reply to you and no email enquiry is answered. Is this possible. Please be warned