Super(sonic) Gatvol

I've called Supersonic multiple times, tried contacting them via the WhatsApp chat and I've sent them two e-mails over the past week and I have not gotten any response. I was sent an additional router and sim card accidentally in March and after speaking with an agent then, I was told the courier would collect the extra package. Guess what? No courier has been sent and I have not had any further communication from them. What's more, the billed me for the extra package despite me not using it. I know that Covid-19 has caused resources to be stretched, but they should not sell a product to a customer if they're unable to provide the service that comes with it.