Scammed and Told I was sent wrong iPad

I ordered an iPad when I switched to Xfinity mobile last week. I received the iPad the next day. That same day I got a call from someone claiming they were an Xfinity agent saying they sent the wrong one and I needed to send it back. They sent me a shipping label and I sent it back. Now when I went to customer service to try and order a new one, they were asking me to contact fedex and resolve the issue myself. I don’t think that is my responsibility. Now I just want to cancel my iPad altogether but I am worried I am going to get charged for it anyway. I don’t know what to do or how to cancel it because I’m not even sure when I’m talking to an actual human at Xfinity or AI.