I have a conviction which I got 9 months in prison. This was 34 years ago (1990) Applied for role, they wanted basic in advert and job app so I answered that I have no unspent convictions which is correct. They offered job with conditional offer letter - I then had to go in and produce all my docs eg education and right to work. The manager then said the role was enhanced DBS. So I immediately told them about conviction and produced a self disclosure statement over circumstances of offence. It then went to their DBS panel and the offer was withdrawn due to me not disclosing conviction on application form. Although they only wanted basic and I was not obliged to. I emailed HR and pointed this out and they said advert was wrong ! I have copies of all this. Is there anything I can do?