Look, if you think you have a legitimate complaint (I'm not saying if you do or don't, we are not privy to the entire story, only the presentation and facts you provide) then take the matter to small claims court. you might prevail, you might not. You'd have to appear in person, though. This is where you'd duke it out, not with us.

I personally believe that, if the month plays out and you've not moved in your "deposit" will eventually become forfeit. If it's a deposit then I cannot see any reason the LL would pull the unit off of the market. It's not rented and if you bail, well, they're out a months rent. The LL has not rented the unit, well, not to anyone but you, unless you're withholding pertinent information. If they are subletting it's possible that their LL is requiring the additional deposit and the rent will go up, especially if the rent includes utilities. Of course, I'm only speculating.

A quick word on the whole verbal agreement thing: who do you prove the terms of said agreement? And if you moved in there wold be nothing preventing the LL from jacking up the rent and then requiring a deposit 60 days out (I think that's the required period of notification).

Maybe you got screwed. Maybe you a few bad decisions and aided in getting screwed I don't know, I'd guess the latter. Better to find out now than later. Next time insist on written documents. Email is okay but hard copy is best. Contracts are written for a reason. Hell, I just sold one of my motorcycles and wrote out a purchase agreement detailing any and all issues with the bike and made two copies for myself and the purchaser to sign (for what that's worth) so that I would have something to fall back on if the buyer had a change of heart. I wrote it all out and I did it for me, to protect me. Next time I recommend doing the same.