Backdated award for Pip mixing with other people d

I have been denied 3 times the backdated payment for the Daily Living descriptor of Mixing with others from Jan 2017 to Nov 2020. I asked for MR after DWP wrote to me in March 2021 and was told I come under High Court ruling of MM v DWP but this has yet to be finalised. After consulting B&W I requested that my claim be looked at again. Denied with same decision paragraph....this has yet to be finalised. I applied again in April 2021 citing if I was awarded 4 points for that descriptor at my last assessment Nov 2020 then do I not qualify for the same points from Jan 2017 when I first claimed. Same old claptrap....this decision has yet to be finalised. I applied again in Sept 2021....yup you've guessed it! The decision has yet to be finalised. As we're talking about approx 5K I am more than a little upset. So I phone DWP (82 mins wait in total) was passed between 3 people and asked for explanation about the decision. It was rather vague, a pleasant gentleman wouldn't really commit himself but did say any back payment, if applicable, would only be from July 2019 when judgement was passed. Not according to this site I politely informed him. He suggested I leave it a couple of months then ring and enquire? I believe this treatment to be stalling tactics as nobody has justified or reasonably explained the decision. Now the big question. Do I take it to an appeal.

Sorry bit long winded but I wanted to show DWP behaviour.