Hi again,(posted 8072 days ago)I am assuming you are taking the advice of this site and are asking for all documentation in relation to their claim.
Their statement "the lender has proved the debt" is a standard response from these people. Another dubious one being "the fact that you had a mortgage proves the debt", which obviously doesn't prove anything - so don't worry about it.
They are just trying to muddy the waters and beat you into submission, so don't give in - please.
Good luck
Stephen