Catherine Tilson

My p60 for the tax year 2021-2022 is incorrect. I have provided my employer with the evidence of this as well as extensive emails, links to gov.uk and this forum pointing to how they can re-issue my p60 and provide an amendment letter, however they keep saying that as the FY is over, they are unable to do this. Can anyone help with what I need to say to them? Do they have any reasonable responsibilities to HAVE to do this?