Listing agent is trying double end the deal. What can I do?

[Lee L.]

There's a 4plex that I'm thinking of purchasing but I suspect the listing agent is trying to double end the deal. He was keen on talking to me earlier in the week when the property first came to market. He said there would be a showing on Saturday, but never confirmed an exact time. He also asked if I was working with an agent, and I said yes, I'd be representing myself since I have a license. I texted and called him on both Thursday and Friday trying to confirm a time, but he wouldn't return my call. Then 10:00PM the night before the showing, I get a text from him saying the showing had been rescheduled to Sunday or Monday "because of multiple offers." WHAT?! What kind of reason is that? After his response, I submitted an offer the next morning well above asking. It's Sunday night now, almost 40 hours after I submitted the offer, and ... crickets! I feel pretty frustrated and completely slimed. Is this what it takes to get a hot deal, to let the listing agent double end the deal?