We sold a vehicle in 2004 and surrendered our plates to DMV and had a bill of sale. The new owner failed to register the vehicle and it was towed. Rickenbacker came after us as the 'last registered owner'. We submitted our documents to Rickebacker to show that this was not our debt. They, of course, say that they "lost" the documents. So we obtained copies of all relevant documents from DMV and a new bill of sale (notarized with the new owner's involvement) and submitted those to Rickenbacker. They simply informed us that they were not accepting the documents.
It should be noted that in all of the telephone conversations with Rickenbacker they were extremely rude and hostile.
After the third attempt to send them documents showing that this is not our debt, they took issue with the dates as they appeared on the notarized bill of sale. We have had enough! Do a google search on "Rickenbacker collections" and you will immediately see the quality of their business practices. There are many stories just like ours here on this website alone. This clearly indicates at least unethical business practices and seems to suggest outright fraud under the terms of the "Fair Debt Collection Act".
We will be seeking legal action against them. If you are victimized by this company DONT GIVE UP! Learn your rights and be prepared to fight.

Good luck and God bless.