Hi , I started my claim in 2021 where I added my 3 children. I was unaware of special circumstances regarding my 3rd child , 3 years layer I was made aware with the legal challenge which had been shown on the media, I have handed in an NCC1 form and they have added my 3rd child for child elemnt , but are refusing to backdate, it amounts to over £11,000.....a desicion maker had said I'm outwith the 13 month time limit ...there is NO time limit with the ncc1 form , any advice ? I have contacted my mp and they are going to advocate for me ...also reported to dwp complaints team as the amount if failings through phone and journal are terrible , agents are not allowed to question on this matter due to the sensitive nature , but they did in detail numerous times ..thanks x