A money judgement order is very important to the lender because it means that they have a court order that you owe them X amount and they can use the various options available to them (attachment of earnings, charging order etc) to enforce that MJO.(posted 8352 days ago)From what you say, it sounds as though they haven't got an MJO. There would be no point in going back and forth in correspondence if they had.
What you need to ask for is a copy of the completion statement from the sale of the property. Take a look at the information on this website and the sample letters for how to ask for extra information.
Once you've got the completion statement, you can go through each item claimed and ask for invoices/statements etc.
So write back to DLA, and ask for a completion statement. When you've got it, take it from there.