Hi Noelene,
I just saw this again.
Did you keep a copy of your original form?
If so use that information,dont guess it just in case they do come across the original. I would not so much complain, but make them know what their mistake has done to your life and the overall tension and upset at having to do all over..I would certainly make them feel obliged at getting this fast tracked or it will cause a depression of great severity.
I hope you do get on ok and win your case for DLA.
Mike