As for the Talaq whether it is said once or twice or thrice at the same time and it was the first Talaq or the second that Talaq is considered to be one Talaq only and that is because when making the contract of marriage, the contract is pronounced once only and like wise to break the contract it only needs once pronounce and the contract is broken.
As for whether this Talaq has gone through or not it is dependable, I mean how the Talaq has taking place needs to be investigated and the one who gave the Talaq and the one who asked for it both needs to be seen by a scholar who they know at their local Masjid and they need to explain what has taking place and how angry they were because an extreme anger invalidates the Talaq that is been pronounced, therefore should take this case to their local Imam and then should wait for the result.
However in my opinion and Allah knows best the man wrote down the Talaq on his own will because if one is extremely angry and out of anger pronounces the Talaq not realizing what he has just said then in this case that Talaq has not happened but as for this case the man wrote it down out of his own will and knew what he was writing and if he was extremely angry then he would not had able to write it down therefore, these kinds of Talaq is valid. However, on should not based on my argument here and should not accept it until they see their local Imam because there is a doubt whether Talaq is valid or not. Allah knows best.