ESA appeal. Support group to WRAG

Please advise. My appeal date is 26th July2019.
II have been moved from Support group to WRAG. In my letter refusing my mandatory reconsideration i was told that to qualify for the Support group I must satisfy one of the activities in Schedule 3 of ESA.
I got a copy of my medical report and replied to the DWP that i thought i should qualify as I met the schedule 3 activities as follows:
Activity 13 Initiating and completing personal action. The HCP answered: Frequently cannot, due to impaired mental funtion, reliably initiate or complete at least 2 personal actions.
Activity 17 : Coping with social engagement due to cognitive impairment or mental disorder. The HCP wrote: Engagement in social contact with someone unfamiliar to the claimant is always precluded due to difficulty relating to others or significant distress experienced by the individual.
I did not receive a written reply so lodged my appeal.
I have been advised verbally by DWP that activity 13 would not qualify me for the support group as it has the letters IAc on the left of the HCP answer mean that this relates to the WRAG and also on activity 17 the letters CSb also relate to the WRAG.
I cannot find anywhere that these letters on the medical report are defined.
On the WCA handbook these activities are listed as schedule 3 descriptors for the support group.
Can anyone please help.