Posting for traffic as there isn't a specific number I can call related to this issue.
I started a new job at the beginning of last year which involves a lot of driving in my own car. My employer pays 25p per mile and told me that I could claim the rest (or a percentage? not quite sure) from HMRC. I know some of my other colleagues have done it and they haven't had any issues.
Anyway, I filled out the form online at the beginning of April and sent it off. It said that it would be completed by the 10th of May, but it wasn't and was updated shortly after online saying "your form is taking longer than usual due to technical problems". I didn't really think much of it and thought it would be sorted soon but we're now in July and I've still not heard anything. I've heard from other people that they have a backlog due to Covid which is understandable.
There isn't a number I can call related to this specific issue so I don't know if they will just tell me to carry on waiting. I might give the general helpline a call later though just to see what they say. My cars had to have a lot of repairs recently and the 25p my employer pays doesn't really stretch very far so the extra money from HMRC would definitely come in handy.
Is there anyone on here who works for HMRC or that deals with them often? Any ideas?