Agreed, you MUST respond. Having seen multiple copies of this letter (thanks Pete/CTC), it's imperative you write, notarize, registered mail w receipt to Ogden. Once you receive the receipt, CALL and follow up w Odgen. Load Skype and an MP3 recorder that records automatically when a call is placed w Skype. Get names, ID #s, etc. Follow w another letter to the one you spoke with (again, notarize, registered mail w receipt) about your phone conversation. Even this may not be enough to stop a letter from Maureen Green, charging the penalty. However, you have a "name" to pursue if it becomes necessary. The key is stop the train before the ACS (Automated Collection System) kicks in.

BTW, it's documented (by others) that the frivpen is actually a "User Fee" based on their own codes. Credit to "woody" on that one.

Not Legal Advice, just my two bits...