Dear Peter,
I'm experiencing the same problem. I received an email informing me that they I have violated the TOS numerious of times and that they will cancel my account. I'm also in shock because I have not violated any of the rules. The only thing I can think about that is not correct is that I don't have a license number. But if that is the reason than they can close 80% of all listings in Barcelona.
I have called customer service numerious of times and they have been totally useless. They say that they will forward my complaint to the department in charge but I have only received 3 times the same standard email saying that they don't need to give me an explanation and that the decision is irrevocable.
I cannot believe that a company like Airbnb would treat their customers like that. I have good reviews and my apartment was completely renovated and looks so much better than many of the crap listings in Barcelona. I spend so much time in corresponding with guests.
So if they feel they need to delete a very successful listing, so be it. However I am very angry on how they treat you and they cannot spend 5 minutes in just giving you the reson for cancelling it.
BTW, the email I received is exactly the same as yours, with the end date of 8 December 2015.
Kind regards,
Ana