Unfair treatment! I'm so frustrated

I'm so frustrated with this service provider. I put in a order on the 19th of June and I have still not received the Sim card. Now they want to continue to bill me twice for something I don't have yet. I've left many emails and no one has gotten back to me. Their call center is off. I left a message on their Facebook page and they said they would call me back. Still nothing. I'm so frustrated. I need them to call me urgently because I need to start working from home as of today. The delivery address will change obviously as today is my last day at work