Half price car tax with mobility pip

Good morning, Help needed please . I tried to claim 1/2 price car tax as I am on ordinary mobility pip. I send my yearly update to tax office, they promptly sent it back saying they needed something else, prop a letter stating from and to dates. My yearly statement came in April and stated the rate I am getting. I don't want to ring pip office as I am 69 and was told my pip would be ongoing when I reached pension age. But who knows if that is correct or not, with all these changes. Appreciate any advice Thank you

Thank you for swift reply, I did receive decision letter in 2015 which stated for 5 years, then COVID .I received a further letter to say I would not be assessed for further year. At this stage I was 66 & was adviced it would be soft touch . At least that's what t government said back in2021. I don't understand that a yearly update will not do. If I contact pip will they b able to give me a new decision letter without assessment???? Thanks

Thank you , really appreciate Ur reply. When I get the courage to telephone what do I ask for please

My confirmation letter states pip until 2022. Do I still ring up and ask for confirmation letter till 2024 so afraid of being recessed. I'm wondering is it worth the 200£ plus 1/2 price tax. Sorry to be asking the same question twice