if DWP are confirming to you , that you are in receipt of a qualifying benefit why (apparently) are they saying something different to BT (that’s the inference from what is occurring) , when BT approach them for confirmation, they will use your NI number and (presumably) your address , DOB etc ., you say you have supplied info to BT confirming you qualify, but it’s not you but the DWP that need to supply this confirmation to BT