In this post you said they were going to fail it.
http://www.iva.co.uk/forum/topic.asp?TOPIC_ID=74579
Now in this posts you state they have failed it. I would still follow the steps highlighted in my response in the previous post, Asking for the exact written reasons and proof of the breach notice they sent and suggest they correct their error and you expect this all within 7 working days or you will be filing a formal complaint with the ombudsman and contacting the insolvency service.
They must have a complaints procedure that they are bound by, you'd be crazy to just accept they have failed you in the last month for an invalid reason.!
Also in your complaint you want to ask for th name of the IP who is responsible for your case or who represents the company,
As they have said they won't converse with you in the ohone or in writng I would address your complaint direct to the highest level possible CEO or similar, who on earth condones their staff saying such a thing - unless they are a shadey bunch - can you name to firm here please so other know to be cautious and not go with them, it might also make them come into action of they read these forums !
Drop the insolvency service a line too and speak to them and ask what they suggest.