I'm sorry to hear that you are having problems with booking. I did too, and when I finally managed to get through on the 'phone I was told that they were having problems with their website. This was weeks ago so I would have thought it would have been sorted by now! None of this helps you I know. They were leafleting outside the Coliseum on Thursday night after Men in Motion which made me think it wasn't selling too well - obviously I was wrong if there are only a few tickets remaining.
As to The Dying Swan it is sometimes danced at the Russian Ballet Icons Gala - this year it is being held on Sunday 9 March at the Coliseum.