DLA SAR

As you may recall I recently ‘passed’ my DLA reassessment, remaining on HRC/LRM (for 5 years). I decided to send away for a SAR (computer and clerical) and asked for the dates 1/5/13-9/8/13. I used those dates because I received the reassessment form sometime at the beginning of May and received the result at the beginning of August (9th of Aug was when I sent away my request). I have now received my SAR with a covering letter saying that “The Department does not hold any clerical records for the period you have requested. This is all the information held about you by DWP to which you are entitled, in relation to your request. The Data Protection Act 1988 states that in some circumstance you right to see some personal information is limited”- are the last 2 sentences a general statement or a personal statement aimed at me?. And I thought there would have been clerical records? Does my filled in DLA form not count as ‘clerical’? They didn’t send me a copy of the DLA form (I have one anyway, but expected to get another copy in the SAR). All I got was a 61 page printout. It says “event result – entitlement change” – is this correct, as I stayed on HRC/LRM? it says it was a ‘favourable decision’. Decision type = offline decision. Decision notification type = none. It also says evidence code – “claim form and statement of disability” – what is a ‘statement of disability’? And then it says ‘evidence used – claim form’.
So basically what I am asking is -
should there be clerical records? perhaps I asked too soon after the decision and they hadn’t been ‘filed’ yet?
should I have used different dates (and if so, can I make another request)?
why does it say entitlement change?
are they trying to tell me they have info that they can’t give me, or was that just a general statement that most people get?
what is a statement of disability?
Also, I noticed that they have my old phone number from approx 3 years ago as my current number. I have asked them in the past to remove it but they didn’t. I am concerned that someone else has now been given that number and that DWP could still phone them looking for me and that could lead to problems for my claim????