I hope that's not the case Deirdre but scalpers getting their hands on tickets which are high in demand seems to be inevitable these days. Not surprising it sold out so quickly given FOTC's popularity and I think it's a small venue. Maybe they'll announce more dates?
I wouldn't believe anything the hotel tells you. They are probably very out of the loop on availability.
Go by what's on the website. If there is a drop down menu for amount of tickets, select that and go through the buying process. Regardless of what it says next to it. It's General Admission, so as long as you have them bought, and show up early, you should be good to go.