Linebarger Goggan Blair & Sampson, LLP Letter for past due traffic fines or fees Miami, Florida

Is this for real? How can a traffic fine go unpaid (as this law firm suggests they were hired by our local Clerk of Courts) without any notice from the DMV or Clerk's Office, and without some subsequent suspension? I actually went to their online payment system and received a message that an online payment couldn't be processed at this time and that I would need to contact their office. Maybe thank goodness! If this is a scam, this pseudo firm should be prosecuted. If this is a legitimate claim, why haven't I been asked for payment by my local government? And have I exposed myself to further internet risk by entering any info at all on their so-called web payment sight? Any assistance would be appreciated!