Litter Fixed Penalty Notices

I was issued with a Fixed Penalty Notice of £75 by two people, dressed in para-military black, armed with body-cams and walk i-talkies and told that I had dropped litter in a doorway. They approached me from behind and even though I am 71 years old they threatened me and followed me, telling me all the time that I would be arrested by the police and that I had committed a criminal offence. Totally confused and frightened I gave them my details only to find out later that they had both lied to me and to the Council because they had not observed me dropping litter but had harassed me in the hope of gaining a conviction for monetary reward from their company.