I have received a Fixed Penalty Notice for Unauthorised Deposit of Waste Section 33(1)(a)(d)/33ZA. Am I able to contest this FPN?

I have a small business in Southwark. We produce very minimal waste, just the occassional cardoard box. I have recently deposited some cardboard in a council recycling bin in our area and received an FPN from the council for this. The recycling bin clearly states that cardboard is accepted. I did not know or have reason to suppose that the act of putting a cardboard box in this bin would constitute a contravention of Section 33(1)(a)(d)/33ZA as the notice states. 

Am I within my right to contest this FPN?