Non Existing Service after payment

If I could give a minus Star I would. I have waited 3 weeks after paying to receive my router and LTE card. I have contacted customer care about 6 times held on for at least 12 - 15 min each time and every time I am promised a call back and delivery. I have not had either. I want to cancel my payment and apparently i have to write to cancellations and wait for a reply. I don't expect one based on the service I have received so far. I have contacted my bank and will pursue that option. Judging by other reviews Supersonic don't seem to care. MTN they are ruining your reputation!