How do I get a refund on an item that the seller is refusing to send me or cancel?

[ged31504]

I placed a bid on an item and won, however the seller is claiming that my item is gone and that I should choose another (not really sure what this means, considering there are no other items).  They also tried saying that I hadn't paid and that I needed to pay before they sent an item, even though my payment went through when I won and confirmed the bid. They also lied about the item description. I requested a cancellation, and they're claiming that eBay won't let them cancel. They've stopped contacting me since. Before I placed a bid, I saw that the item was under the money back guarantee policy, but I can't find a way to actually put this policy to use. I also can't find a way to directly contact eBay about this issue, I can only chat with the bot.  How do I contact someone to resolve this issue? Is there a live chat? Please help me find a way to resolve this issue.

[inceptions]

When it's past the estimated delivery date shown in your Purchase History, you have up to 30 days to use the option next to the transaction to open a case for an item not received. The seller will have 3 business days to prove delivery or refund. If he doesn't, go back to the case on day 4 and use the option to ask eBay to step in. They will force the refund.

[ged31504]

Thank you so much! I figured I'd have to wait but wanted to make sure I wasn't missing something.

[inceptions]

Hopefully the seller will resolve this sooner, but now you have your backup plan!