HI JCB Driver,
I am not surprised they didn'reply. I experienced the same thing on many occasions when sending them medical evidence. In the end I resorted to using recorded delivery but they still denied receiving it. I guess their reasoning is that they don'have to review the situation if they can deny being in posession of evidence to support my claim.
I am hoping they don't start playing the same game with my PIP application , I certainly wouldn't put it past them!
Since it's fairly obvious to me that the DWP central mailing centres get thousands of letters per day, I always send any document via Special Next-Day Delivery which is far more secure than Recorded Delivery & this is the advice I always give out on the Carers UK forum.
We've gone through a DLA claim & two PIP claims for my wife (I'm her DWP appointee) & we've never had any issues whatsoever.
Her first DLA claim was rejected but I asked for an MR & ATOS arranged a home visit assessment by a doctor & her claim was allowed.
When her DLA claim expired we had to claim for PIP & she was assessed,at home, by a nurse & her claim was allowed.
We recently had to complete a paper interim review but as there'd been no improvement her PIP claim was continued until Sept 2020.
All the DLA / PIP horror stories don't reflect the experience that we've had.