I would have called them on the phone. You are not the only one this has happened to when dealing with CTD. I had the same problem a few years back when I phoned in an order in which their new catalog said the cost was $1X. When I called, it was $1.5X.
Unfortunately, with all the buying frenzy & hysteria after a recent event, you can only expect more of the same from certain retailers. When the frenzy abates, I would avoid future businesses with retailers like this.