Supersonic Bad Service!!!!

I signed up with Supersonic on 2/03/2021 made payment of R399 and I was advised that my router&sim will be delivered within 3-5 days. When it arrived I was advised to allow 24hrs for my sim card to be activated. After 24hrs I noticed that there's a problem which I raised to them. I then discovered that the sim card had no service and that with all the troubleshooting I still had issues so I was told that they will order a new sim card which I will get after 3-5 days till today I dont have my sim card . I got an sms that RAM will be delivering it till now nothing has happened. I even spoke to their supervisor last thursday telling her that I will stay home and wait for my sim card nothing happend then I get an invoice saying I owe them R399 R399 when I hadn't used their service for the whole of March. I still complained on their Facebook page and at this point I'm really angry.