PIP Tribunal went halfway my way

Hello All
and that I would therefore not be receiving PIP! I was astonished, to say the least
After having received DLA (Higher Rate Mobility and Standard Rate Care) for 11 years, I was advised last year that my DLA would be ending and was invited to apply for PIP. This I duly did (using the Benefits and Work guides) and had my face to face assessment in September 2019. A few weeks later the dreaded brown envelope arrived and it contained the news that I had been awarded ZERO points ! I was astonished to say the least. Although I had expected a change (with everything I had read) I did not expect to be assessed with no points at all. I then went to Appeal )withe the help of your useful guides) and eventually had my Tribunal by telephone on 24 November 2020. I received their decision in the post the following day. I was awarded 8 points for care (Standard Rate) and 10 points for Mobility (Standard Rate). Although I was disappointed to lose my Motability car, I was grateful that they had at least recognised my disabilities and validated my Appeal.

In order to maintain my independence I now need to buy myself a car (the Motability car has to be returned by 8 December 2020. I am depended on the backdated payment of PIP in order to do this and wondered how long it will take for my monthly PIP payment to be put in place and the backdated payments to be made? Any information will be useful.

Thanks!