Correct me if I am wrong, but you should be telling the half wits what you can afford to pay and not the other way around.
My use of 'Half wits' I feel is justified since they fail to deal with someone who is obviously in distress. You have already written to them and e-mailed them on a number of occasions and yet they ask you to write again. DFD are in a position to assist but are choosing not to give this matter some priority. The question has to be asked why?
I'm going to stick my neck out and suggest that you contact them tomorrow and ask to speak directly to the IP with a view to making a formal complaint to the licensing body in the absence of satisfaction from the 'service' they are providing. You may find it difficult, but you must insist on speaking to the IP. If they are not in ask to speak to another IP. If none are available ask for their direct e-mail address.
If you are not certain if you are in an IVA or DMP, have a look at this site
http://www.insolvency.gov.uk/eiir/IIRNa ... hMapIE.asp
Select 'All offices in England and Wales' and then enter your name. If you are in an IVA you will find yourself on there. If you are on a DMP you won't.
Stick to your guns and insist on speaking to an IP directly. (Get hubby to do it for you [:)])
Tell it like it is.