Hey I was also unable to get on this site for days. I came here and immediately searched for your update.
I am so sorry that your clinic obviously screwed up majorly... The chances are so slim for something like that to happen but it obviously still does 
I really hope that you get your money back and that you overcome your shock and find a way to see the positives. (HUGS) Like I already mentioned - 
twins are so lovely (in my opinion) and maybe your DD will really enjoy being the only princess 
Good luck with dealing with the clinic!